P0762 – Shift Solenoid “C” Stuck On

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: General | Location: Designator C

Definition source: SAE J2012/J2012DA (industry standard)

P0762 is a powertrain diagnostic trouble code that indicates the control module has detected a condition consistent with Shift Solenoid “C” being stuck on. In practical terms, this means the module believes the “C” shift solenoid is remaining applied when it should be able to turn off, which can affect commanded gear changes and shift quality. How the solenoid is named, where it is located, and exactly how the monitor runs can vary by vehicle, so use the correct service information and wiring diagrams for your application. The code by itself does not prove a specific part has failed; it only reports what the module detected based on its strategy and feedback.

What Does P0762 Mean?

P0762 means “Shift Solenoid ‘C’ Stuck On.” Per the official definition, the powertrain control module (or transmission control module, depending on vehicle design) has determined that the shift solenoid identified as “C” is not responding as expected and appears to remain on when the module is attempting to switch it off. SAE J2012 defines the structure and naming of DTCs, while the actual solenoid labeling, hydraulic routing, and confirmation logic used to decide “stuck on” are platform-dependent. Diagnosis should focus on verifying whether the solenoid command and the transmission’s observed response (or the module’s inferred response) agree.

Quick Reference

• Subsystem: Automatic transmission shift control (Shift Solenoid “C” control and its hydraulic/actuation path).
• Common triggers: Solenoid mechanically sticking, contamination/varnish, restricted valve body movement, or a command/response mismatch that persists during the monitor conditions.
• Likely root-cause buckets: Wiring/connector, shift solenoid actuator, hydraulic/valve body issue, power/ground integrity, control module/strategy (varies by vehicle).
• Severity: Often moderate to high; may cause harsh shifts, incorrect gear operation, reduced drivability, or a protective “failsafe” mode.
• First checks: Scan data and freeze frame review, fluid level/condition check (if serviceable), harness/connector inspection at the transmission, and confirm the code is repeatable.
• Common mistakes: Replacing the solenoid before verifying connector pin fit, harness damage near the transmission, fluid contamination, or confirming that the “stuck on” condition is not a hydraulic/valve body issue.

Theory of Operation

Shift solenoids are electrically controlled actuators used by the transmission control system to route hydraulic pressure and apply or release clutches/bands to achieve specific gear ratios. The module commands each solenoid on or off (or, on some designs, modulates it) to create the hydraulic state required for the desired gear and shift timing. The solenoid identified as “C” is one of these control elements; what it controls specifically varies by vehicle.

To detect a “stuck on” condition, the module compares its commanded state to expected transmission behavior. Depending on design, it may infer solenoid performance from shift timing, ratio calculations (engine speed vs output speed), pressure control feedback, or other plausibility checks. If the module commands Solenoid “C” off but the transmission response continues to match an “on” state for longer than allowed by its strategy, it can set P0762.

Symptoms

• Harsh shifting: Upshifts or downshifts feel abrupt or unusually firm.
• Wrong gear: Vehicle may start out in an unexpected gear or hold a gear longer than normal.
• Shift flare: Engine speed rises during a shift as if the transmission momentarily slips.
• Failsafe mode: Transmission may enter a limited-gear or protective operating mode.
• Reduced performance: Sluggish acceleration due to improper gear selection or limited shifting.
• High engine speed: Elevated RPM at cruising speeds if upshifts are inhibited.
• Warning lamp: Malfunction indicator lamp (MIL) or transmission warning message may illuminate.

Common Causes

• Connector issues at the solenoid/transmission harness: Loose lock, poor terminal tension, corrosion, fluid intrusion, or pin fit problems that alter commanded/actual solenoid operation.
• Harness damage: Chafing, crushed wiring, heat damage, or internal conductor breaks in the solenoid control circuit between the control module and the transmission/valve body connector.
• Short to power in the solenoid control circuit: Unwanted battery/ignition feed energizing the solenoid when it should be off, causing a “stuck on” condition.
• Short between circuits: Solenoid “C” control wire shorted to another solenoid control wire, causing unintended actuation during certain shift commands.
• Power/ground distribution fault: Shared transmission solenoid feed/ground problem (high resistance, loose ground point, or poor splice) that prevents proper control and release of the solenoid.
• Shift solenoid “C” mechanical/electrical fault: Internal sticking, contamination, or coil-related issues that can keep the solenoid applied even when the command changes.
• Valve body/hydraulic sticking: Sticking valve/spool or contamination causing hydraulic apply pressure to persist, making it appear the solenoid is stuck on (varies by vehicle design).
• Control module driver/control issue: Driver circuit fault or logic/control issue that continues commanding the solenoid on (confirm only after circuit and actuator checks).

Diagnosis Steps

Tools typically needed include a scan tool with bidirectional controls and transmission live data (where supported), a digital multimeter, and wiring diagrams/service information for connector views and pinouts. Helpful additions are back-probing tools, a test light (as allowed by service info), and supplies for connector inspection/terminal tension checks. If access requires removal, have appropriate hand tools and follow safety procedures.

1. Confirm the DTC and capture freeze-frame data: Scan for P0762 and record freeze-frame and any related powertrain codes. Note conditions when the code set (gear, speed, temperature, commanded state if available). Clear codes and see if P0762 returns immediately or after a drive cycle.
2. Check for related codes and monitor strategy clues: If other shift solenoid, line pressure, gear ratio, or transmission electrical supply codes are present, address them first or in parallel, since they can affect solenoid control and how “stuck on” is detected.
3. Review live data for command vs response (if available): With the scan tool, observe transmission parameters that indicate shift solenoid “C” command and any related feedback/gear state. Log data during the conditions that typically reproduce the fault. Look for a mismatch where the solenoid appears active when commanded off, or the transmission state indicates it did not release.
4. Perform a visual inspection of the external harness and connectors: Inspect the transmission case connector, harness routing, and any intermediate connectors for damage, fluid intrusion, corrosion, loose locks, or pulled/bent terminals. Repair obvious issues, clear codes, and re-test.
5. Wiggle test while monitoring data: With the engine running as permitted (or key on, depending on test), gently move the harness near the transmission connector and along common rub points while watching the solenoid command/related PIDs and DTC status. If the status flickers or data changes, isolate the exact area and repair the connection or wiring.
6. Check the solenoid “C” control circuit for an “always on” condition: Using service information, identify the solenoid “C” control pin(s). With the solenoid commanded off (or key state per service info), test the control circuit for unintended power feed. Evidence of voltage present when it should not be indicates a short to power or a cross-short from another circuit.
7. Check for shorts between solenoid control circuits: With the harness disconnected at the transmission connector (and module connector if required by service info), perform continuity checks between solenoid “C” control and other solenoid control wires. Any continuity where none should exist suggests insulation damage or internal harness faults.
8. Voltage-drop test the power and ground paths under load: If service info allows commanding solenoids on, load the circuit and perform voltage-drop tests across the solenoid feed and ground paths (shared feed/ground circuits are common). Excessive drop indicates high resistance at splices, terminals, grounds, or connectors that can disrupt proper solenoid release/control.
9. Measure the solenoid coil and check for sticking indicators: With the connector isolated per service info, measure solenoid “C” resistance and compare to manufacturer specifications. If bidirectional control is supported, command solenoid “C” on/off while listening/feeling for consistent actuation (where accessible). Out-of-spec readings or inconsistent response supports a solenoid/valve body issue.
10. Differentiate wiring/driver vs hydraulic/mechanical concerns: If the circuit checks pass (no shorts, good voltage drops, connectors sound) but symptoms persist, follow service information to evaluate valve body/hydraulic sticking and confirm whether the control module is continuing to command the solenoid on when it should be off. Only suspect a module/driver issue after verifying wiring integrity and actuator function.

Professional tip: When diagnosing a “stuck on” shift solenoid code, prioritize proving whether the solenoid is being energized when it should be off. If you confirm unintended energization, focus on shorts to power or cross-shorts first. If energization is correct but the transmission state doesn’t change, shift your focus to solenoid/valve body sticking and power/ground integrity using voltage-drop testing under load.

Possible Fixes & Repair Costs

Repair costs for P0762 vary widely because the correct fix depends on what testing confirms: an electrical issue in the shift solenoid “C” control circuit, a solenoid that is mechanically stuck, a hydraulic condition, or a control/module command problem. Parts access and labor time also vary by vehicle.

• Repair wiring/connector issues: Clean corrosion, correct pin fit, repair damaged wiring, and secure routing to prevent chafing that can hold the solenoid commanded on.
• Restore power/ground integrity: Repair poor grounds or power feeds found by voltage-drop testing; correct shared ground issues affecting multiple solenoids.
• Replace shift solenoid “C”: Replace only after confirming the solenoid is sticking or electrically out of specification per service information.
• Service transmission fluid and filter: If fluid condition is contaminated or incorrect and diagnostics indicate it contributes to sticking or abnormal hydraulic behavior (varies by vehicle design).
• Valve body/mechatronic service: Repair/clean components if testing indicates the solenoid is being held on due to internal sticking, debris, or hydraulic cross-leaks (procedure varies by vehicle).
• TCM/PCM corrective action: Perform required resets/relearns after repairs; update or replace the control module only if command/output testing proves a control-side fault.

Can I Still Drive With P0762?

Driving with P0762 is sometimes possible, but it is not recommended if you notice harsh shifts, slipping, reduced acceleration, or the vehicle entering a limited-performance mode, because these can increase the risk of loss of control in traffic. If you also have stalling, a no-start condition, reduced power warnings, or any brake/steering warning lights, do not drive—have the vehicle towed and diagnosed. Even when it feels “mostly normal,” continued driving can worsen shift quality and heat load, so confirm the cause promptly.

What Happens If You Ignore P0762?

Ignoring P0762 can lead to progressively harsher shifting, flare or slip events, repeated limited-operation strategies, and elevated transmission temperatures. Over time, abnormal apply pressures and heat can accelerate wear of clutches, seals, and fluid, potentially turning an electrical or solenoid issue into a larger hydraulic or mechanical repair. The fault may also trigger additional transmission-related DTCs as the control module detects gear ratio or shift timing deviations.

Related Solenoid Shift Codes

Compare nearby solenoid shift trouble codes with similar definitions, fault patterns, and diagnostic paths.

• P0757 – Shift Solenoid “B” Stuck On
• P0752 – Shift Solenoid “A” Stuck On
• P0772 – Shift Solenoid “E” Stuck On
• P0767 – Shift Solenoid “D” Stuck On
• P2814 – Shift Solenoid “J” Stuck Off
• P2813 – Shift Solenoid “J” Stuck On

Key Takeaways

• P0762 indicates a stuck-on condition: The control module has detected shift solenoid “C” behaving as if it is stuck on.
• Don’t assume the solenoid is bad: Wiring, connectors, power/ground faults, hydraulic sticking, or control-output issues can produce the same result.
• Test-driven diagnosis matters: Use scan tool data, command tests (if supported), voltage-drop checks, and harness inspection before replacing parts.
• Driveability can be affected: Harsh shifts, slipping, or failsafe operation may occur depending on vehicle strategy.
• Address promptly: Continued driving can increase heat and wear, raising the chance of more extensive transmission damage.

Vehicles Commonly Affected by P0762

• Vehicles with electronically controlled automatic transmissions using multiple shift solenoids
• Vehicles with a dedicated transmission control module or integrated powertrain controller managing shift solenoids
• High-mileage vehicles where internal wear and fluid contamination can contribute to sticking conditions
• Vehicles used for frequent stop-and-go driving where heat and repeated shifting cycles are elevated
• Vehicles operated under heavy loads or towing that increase transmission temperatures and stress
• Vehicles exposed to water intrusion or corrosion risk affecting transmission connectors or harness routing
• Vehicles with recent transmission or engine work where disturbed wiring/connectors can create control issues
• Vehicles with infrequent fluid service where degraded fluid may contribute to valve body/solenoid sticking (varies by vehicle)

FAQ

Does P0762 mean shift solenoid “C” is definitely bad?

No. P0762 means the module detected shift solenoid “C” stuck on, but that outcome can be caused by wiring/connector faults, power/ground problems, internal sticking in the valve body, fluid-related issues, or a control-output problem. Testing is required to confirm the root cause.

Can low or dirty transmission fluid cause P0762?

It can contribute in some cases, depending on vehicle design. Incorrect fluid level or degraded/contaminated fluid may promote sticking in hydraulic circuits or affect solenoid/valve movement. However, you should not assume fluid is the cause without verifying level/condition correctly and confirming the fault with scan data and circuit checks.

Will clearing the code fix P0762?

Clearing the code only resets stored fault information; it does not correct the underlying condition. If the solenoid “C” stuck-on condition is still present, the DTC will typically return after the monitor runs, often along with shift quality changes.

What’s the difference between an electrical problem and a “stuck on” solenoid?

An electrical problem involves the command circuit or solenoid coil being driven or powered incorrectly (for example, a short-to-power or an unintended ground path), which can keep the solenoid energized. A “stuck on” condition can also be mechanical/hydraulic, where the solenoid or valve does not return to its normal state even when electrical control is correct. Proper diagnosis checks both command/output behavior and the physical/hydraulic response.

What should I check first before replacing parts?

Start with basics: scan for related transmission DTCs, review freeze-frame data, verify fluid level/condition per service information, and inspect the transmission harness and connectors for damage or corrosion. If supported, compare commanded solenoid states to observed behavior in live data and perform voltage-drop tests on power and ground paths before condemning the solenoid or valve body.

After any repair affecting shift solenoid “C,” confirm the fix by clearing DTCs, completing the appropriate drive cycle, and rechecking for pending codes while logging live data to verify the solenoid command and shift response remain consistent.