P0773 – Shift Solenoid “E” Electrical

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

Definition source: SAE J2012/J2012DA (industry standard)

P0773 is a powertrain diagnostic trouble code that indicates the control module has detected an electrical fault related to Shift Solenoid “E.” This is not a performance or “stuck” code by definition; it points to an electrical issue in the solenoid circuit or its control/feedback path as monitored by the transmission control logic. The exact monitor strategy, solenoid naming, and the conditions that set the code can vary by vehicle and transmission design, so confirm connector views, pin functions, and test specifications using the correct service information for the specific platform. Treat P0773 as an evidence-based electrical diagnosis: verify the circuit, verify the solenoid, and only then consider control-module or internal transmission concerns.

What Does P0773 Mean?

P0773 means the module responsible for transmission control has detected an electrical fault associated with Shift Solenoid “E.” Per the official definition, the issue is in the electrical domain (circuit/control/feedback) for that solenoid rather than a confirmed mechanical hydraulic failure. SAE J2012 defines standardized DTC structure and naming conventions, but the physical location of “Solenoid E,” the wiring route, and the specific electrical tests used to flag a fault can differ by vehicle. Use this code as a direction to test the solenoid “E” electrical circuit: power supply, ground, control driver, connectors, and harness integrity.

Quick Reference

• Subsystem: Shift Solenoid “E” electrical circuit (transmission solenoid control/driver and associated wiring/connectors).
• Common triggers: Open/shorted wiring, poor connector contact, solenoid coil electrical fault, loss of power feed or ground, driver/control circuit malfunction.
• Likely root-cause buckets: Wiring/connector faults; solenoid/actuator fault; power/ground distribution issue; control module/driver issue; internal harness/connector issue (varies by vehicle).
• Severity: Often moderate to high; may cause harsh shifts, limited shifting, reduced drivability, or a protective mode depending on strategy.
• First checks: Scan for related transmission and power supply DTCs, verify transmission connector seating/condition, inspect harness routing for damage, confirm fuse/relay feeds and grounds, clear and recheck after a short drive.
• Common mistakes: Replacing a solenoid without proving the circuit, ignoring shared power/ground issues, skipping connector pin-fit inspection, or assuming a mechanical transmission failure from this electrical code alone.

Theory of Operation

Shift solenoids are electrically controlled valves used to route hydraulic pressure so the transmission can apply or release specific elements for different gear ratios. The control module commands a given solenoid on or off (or, on some designs, modulates it) to achieve the desired shift schedule. “Solenoid E” is simply one of the controlled solenoids in the system; which clutch/valve it influences varies by vehicle.

To determine whether the circuit is healthy, the module monitors the solenoid control circuit electrically. Depending on design, it may supervise commanded state versus observed electrical behavior (such as current flow, circuit continuity checks, or driver feedback). If the circuit does not behave electrically as expected—due to an open, short, excessive resistance, poor connection, or driver issue—the module flags an electrical fault and stores P0773.

Symptoms

• Harsh shifting: Abrupt gear changes or harsh engagements during acceleration or deceleration.
• Shift flare: Engine speed rises unexpectedly during a shift, suggesting the commanded shift did not apply as intended.
• Gear limit: Transmission may remain in one gear or have restricted shifting (protective/limp strategy varies by vehicle).
• Delayed engagement: Noticeable delay when shifting into drive or reverse.
• Warning lamp: Malfunction indicator lamp and/or transmission warning message illuminated.
• Poor performance: Reduced acceleration or inconsistent response due to abnormal shift scheduling.
• Secondary codes: Additional transmission electrical or ratio-related codes may appear depending on how the system reacts.

Common Causes

• Open circuit or high resistance in the Shift Solenoid “E” control wire(s) between the module and the transmission connector
• Short to ground or short to power on the Shift Solenoid “E” circuit causing an abnormal electrical condition during module command
• Poor connector engagement, backed-out terminal, corrosion, fluid intrusion, or damaged seals at the transmission case connector or inline harness connectors
• Damaged wiring harness (chafing, pinched section, heat damage) near the transmission, bellhousing area, or along routing points and retainers
• Shift Solenoid “E” internal electrical fault (coil open/short or abnormal electrical behavior under load)
• Shared power feed or shared ground issue affecting the solenoid circuit (common power supply/ground splice, fuse/relay path, or ground point problem)
• Valve body/internal harness connection issue (varies by vehicle) affecting electrical continuity to the solenoid
• Transmission control module or powertrain control module driver/circuit fault (less common; confirm all external circuit tests first)

Diagnosis Steps

Tools typically needed include a scan tool capable of reading transmission-related data and commanding actuators (if supported), a digital multimeter, and a wiring diagram/service information for the correct pinouts and specifications. Helpful additions include back-probing leads, a test light appropriate for control circuits (as allowed by service info), and basic harness/connector inspection tools.

1. Confirm the DTC. Scan for all stored and pending codes and record freeze-frame data. Note any companion transmission or power/ground-related codes, since they can change the diagnostic path.
2. Clear codes and perform a short road test or run conditions that typically command shifts (as safely possible). Recheck for P0773 returning. If it does not return, treat the issue as intermittent and prioritize harness/connector and wiggle testing.
3. Use the scan tool to review transmission-related live data (varies by vehicle), focusing on any indicators that suggest the module is commanding Shift Solenoid “E” and whether the system reports an electrical fault at the same time. Save a log so you can correlate the fault to operating conditions.
4. Perform a visual inspection of the Shift Solenoid “E” circuit path (as identified in service info). Check harness routing near the transmission for chafing, pinching, heat damage, or contact with sharp edges. Inspect the transmission case connector for damage, bent pins, poor pin fit, corrosion, or signs of fluid intrusion.
5. Wiggle test with monitoring. With the engine running (or key on, as appropriate) and the scan tool connected, gently manipulate the harness and connectors related to the solenoid circuit while watching for the fault to set, data to glitch, or the transmission to change behavior. If the symptom is induced, isolate the exact segment and connector.
6. Verify power and ground integrity for the solenoid feed/return paths (design varies by vehicle). Use service information to identify the solenoid’s power supply source and ground strategy. Perform voltage-drop testing on the relevant power and ground paths under load (during commanded solenoid operation if possible). Excessive voltage drop indicates resistance in wiring, terminals, splices, or ground points.
7. Check for shorts and opens in the control circuit. With the circuit safely de-energized per service procedures, use a multimeter to check continuity between the module and transmission connector pins for the solenoid circuit, and check for short-to-ground and short-to-power conditions. Compare results to service information expectations and inspect any segment that tests abnormal.
8. Measure the solenoid circuit/coil electrical condition as directed by service information (varies by vehicle). If access requires disconnecting the transmission connector, evaluate the solenoid side for an open or shorted condition. If readings are out of specification or unstable when flexing the connector/internal harness, suspect the solenoid, internal harness, or terminal interface.
9. If the scan tool supports bidirectional control, command Shift Solenoid “E” on/off (or through available functional tests) and observe whether P0773 sets immediately, whether the circuit behaves consistently, and whether other solenoids on the same power/ground share similar issues. If multiple solenoids show electrical faults, prioritize shared feeds/grounds and connector integrity.
10. Only after external circuit checks pass, evaluate module-side concerns. Confirm module power supplies and grounds are solid with voltage-drop testing. If the wiring, connectors, shared feeds/grounds, and solenoid test good but the code repeats under the same conditions, follow service information for module driver diagnostics and any required verification steps before replacement or reprogramming.

Professional tip: Treat P0773 as an electrical diagnosis first. Many repeat comebacks happen when the solenoid is replaced without proving the circuit can carry load with low resistance. A clean-looking connector can still have poor terminal tension or hidden corrosion; voltage-drop testing during commanded operation and a targeted wiggle test are often the fastest ways to pinpoint the real fault.

Possible Fixes & Repair Costs

Repair cost for P0773 varies widely by vehicle because the code points to an electrical fault affecting shift solenoid “E,” and the actual cause may be wiring, connectors, the solenoid, or a control issue. Diagnosis time, access to components, and parts quality all change the final total.

• Repair wiring damage: Restore continuity and correct routing where the solenoid “E” control circuit is chafed, pinched, or broken.
• Clean and secure connectors: Address corrosion, fluid intrusion, bent terminals, poor pin fit, or loose locks at the solenoid/valve body connector and module connector.
• Restore power/ground integrity: Repair shared feeds, grounds, or internal harness connections that create excessive voltage drop under load (fix the verified drop, not just the symptom).
• Replace shift solenoid “E”: Replace only after electrical testing confirms the solenoid coil or internal connection is faulty (varies by vehicle whether it is serviced individually).
• Repair internal transmission harness: Replace/repair the internal harness if testing shows intermittent opens/shorts between the case connector and solenoid “E.”
• Module-side repair: If all external circuits test good, address the control module driver/circuit issue per service information (may include reprogramming or module replacement where applicable).

Can I Still Drive With P0773?

You may be able to drive short distances, but it is not recommended if you notice harsh shifting, slipping, delayed engagement, limp/limited-gear operation, or if the vehicle behaves unpredictably during acceleration. Because P0773 is an electrical fault tied to shift control, continued driving can increase stress on the transmission. Do not drive if you have reduced power that affects merging, if the vehicle will not shift out of a single gear safely, or if any warning indicates braking or steering assist is compromised; verify the specific guidance in service information for your vehicle.

What Happens If You Ignore P0773?

Ignoring P0773 can lead to persistent shift problems, reduced fuel economy, overheating due to improper shift scheduling, and accelerated wear of clutches and bands from repeated harsh or incorrect gear changes. In some strategies, the control system may default to a fail-safe mode that limits gears and performance, which can create safety risks in traffic and increase the chance of additional transmission-related DTCs.

Related Solenoid Shift Codes

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

• P0763 – Shift Solenoid “C” Electrical
• P0758 – Shift Solenoid “B” Electrical
• P0753 – Shift Solenoid “A” Electrical
• P0768 – Shift Solenoid “D” Electrical
• P0765 – Shift Solenoid “D”
• P0764 – Shift Solenoid “C” Intermittent

Key Takeaways

• P0773 is electrical: It indicates an electrical fault related to shift solenoid “E,” not a confirmed mechanical transmission failure.
• Start with circuits: Wiring, connector condition, power/ground integrity, and internal harness issues are common and should be tested first.
• Verify under load: Use loaded testing (including voltage-drop and commanded on/off checks) to avoid false “good” results from simple continuity tests.
• Limp mode is possible: Many vehicles may limit shifting to protect the transmission, affecting drivability and safety.
• Fix only what’s proven: Replace the solenoid or module only after testing confirms the fault location.

Vehicles Commonly Affected by P0773

• Vehicles with electronically controlled automatic transmissions: Solenoid-controlled shift scheduling is required for this DTC to apply.
• Vehicles using multiple shift solenoids: Designs that label solenoids by letter/position may report a specific “E” circuit fault.
• Higher-mileage vehicles: Harness fatigue, connector wear, and terminal tension issues become more likely over time.
• Vehicles exposed to moisture/contamination: Corrosion or fluid intrusion at connectors can trigger electrical DTCs.
• Vehicles with recent transmission service: Pinched internal harnesses, mis-seated connectors, or disturbed wiring can create an electrical fault.
• Vehicles with underbody harness exposure: Road debris or heat can damage external wiring to transmission connectors.
• Vehicles operated in high-heat conditions: Elevated temperatures can worsen marginal connections and increase electrical resistance.
• Vehicles with prior wiring repairs: Splices, aftermarket routing, or poor repairs can introduce opens/shorts or intermittent contact.

FAQ

Does P0773 mean shift solenoid “E” is bad?

No. P0773 indicates an electrical fault involving the shift solenoid “E” circuit. The solenoid can be faulty, but wiring damage, connector/terminal problems, power/ground issues, or a control module driver problem can produce the same code. Testing is required to confirm the root cause.

Will P0773 clear itself?

It may clear temporarily if the issue is intermittent, such as a poor connection that makes contact again. However, the underlying electrical fault typically remains and the code often returns under similar conditions. Proper diagnosis should focus on reproducing the fault and verifying circuit integrity.

Can low transmission fluid cause P0773?

P0773 is defined as an electrical fault, so low fluid level is not the direct meaning of the code. That said, abnormal operation caused by fluid issues can coincide with electrical codes, and a vehicle may set multiple DTCs at once. Check fluid condition only as a supporting inspection and follow service information.

What’s the difference between a wiring problem and a solenoid problem for P0773?

A wiring/connector problem usually shows up as an open, short, high resistance, or intermittent contact between the control module and the solenoid, often revealed by wiggle testing and voltage-drop testing under load. A solenoid problem is indicated when the circuit tests good but the solenoid’s electrical characteristics or operation do not meet service specifications.

Should I replace the transmission control module if I have P0773?

Not as a first step. Module replacement is typically considered only after confirming the wiring, connectors, power/grounds, and the solenoid/harness are all within specification, and after verifying the module output/driver behavior per service information. Misdiagnosing the module can lead to unnecessary cost and repeat faults.

If you’re scheduling repairs, bring a note of when the symptoms occur (cold start, after warm-up, bumps, or specific shifts) because that pattern can help pinpoint whether P0773 is caused by an intermittent connection, a harness issue, or a component that fails under heat or vibration.