P0907 – Gate Select Position Circuit High

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Circuit High

Definition source: SAE J2012/J2012DA (industry standard)

P0907 indicates the powertrain control module detected a high electrical signal in the Gate Select Position circuit. In plain terms, the circuit input the module uses to determine gate select position (varies by vehicle design) is reading higher than expected for the current operating conditions. This is a signal-level fault, not a confirmed mechanical failure. Because gate select sensing and its wiring architecture vary by vehicle, the exact sensor type, reference circuit, and the strategy used to set the code can differ. Always verify circuit routing, terminal identification, and testing specifications using the correct service information for the vehicle you are working on.

What Does P0907 Mean?

P0907 – Gate Select Position Circuit High means the control module has identified a high-input condition on the circuit associated with the gate select position signal. Per SAE J2012 DTC structure conventions, this code is a standardized powertrain fault entry describing an electrical state the module considers too high, such as a short to power, an open ground path, an open signal circuit that biases high, or an internal sensor/output fault driving the signal high. The code describes the circuit behavior the module observed; it does not, by itself, prove a specific component has failed.

Quick Reference

• Subsystem: Gate Select Position sensor/switch circuit input to the powertrain control module (and related wiring/connectors).
• Common triggers: Signal circuit short-to-power, open ground/return, biased-high reference feed issues, or an internal sensor output stuck high.
• Likely root-cause buckets: Wiring/connector faults, sensor/switch fault, power/ground distribution issue, terminal tension/corrosion, module input fault (less common).
• Severity: Often moderate to high; may affect shift selection logic, engagement authorization, or drivability depending on vehicle strategy.
• First checks: Verify related fuses/feeds, inspect harness near moving/linkage areas, check connectors for corrosion/pushed pins, confirm ground integrity.
• Common mistakes: Replacing the sensor/actuator without proving a high-input condition or without checking for a short-to-power in the signal harness.

Theory of Operation

The gate select position circuit typically reports the current gate selection state to the control module using a discrete switch set, a resistive network, or a position sensor that produces a variable signal. The circuit usually shares a reference feed and a ground/return path, and the module continuously interprets the input as a valid position when the signal remains within expected limits and transitions in a rational way.

P0907 sets when the module detects the gate select position input is abnormally high for a calibrated time or operating condition. Common electrical reasons include a signal wire shorted to a power source, a missing ground that allows the signal to float high, a disconnected circuit that biases high through internal pull-ups, or a sensor output that is stuck high. The exact enable conditions and filtering vary by vehicle.

Symptoms

• Warning light: Check engine light or powertrain warning illuminated.
• Shift concern: Incorrect gear/gate indication or unexpected gate selection behavior.
• Limited operation: Fail-safe or reduced functionality related to shift control, depending on strategy.
• No-start/authorization: Start inhibited if the system cannot validate a required gate/position state (varies by vehicle).
• Harsh/erratic shifts: Abnormal shift timing or engagement behavior when the input is deemed invalid.
• Intermittent behavior: Symptoms that change with vibration, harness movement, or temperature due to marginal connections.

Common Causes

• Short-to-power in the gate select position signal circuit (harness damage, rubbed-through insulation, pinched wiring)
• Open or high-resistance in the sensor ground circuit causing the signal to read high (broken conductor, poor splice, loose ground point)
• Connector issues at the gate select position sensor/actuator or control module (water intrusion, corrosion, backed-out terminals, poor pin fit)
• Short between the gate select signal wire and a reference/feed wire inside the harness (chafing near brackets, tight bends, harness movement points)
• Faulty gate select position sensor (internal failure producing a persistently high output)
• Fault in the gate select mechanism/actuator assembly that houses the position sensing element (varies by vehicle design)
• Power or reference circuit fault feeding the sensor (regulator/short creating an elevated reference level; verify per service information)
• Control module input circuit fault (less common; confirm all external circuits and sensor integrity first)

Diagnosis Steps

Basic tools include a scan tool with live data and data logging, a digital multimeter, back-probing or breakout leads, and wiring diagrams/service information for your exact vehicle. A test light may help with power/ground checks where appropriate. If available, use an oscilloscope for signal integrity checks. Plan for a careful visual inspection, wiggle testing, and voltage-drop testing to confirm circuit health.

1. Confirm the DTC and capture freeze-frame data. Record any related transmission/shift or selector position codes, then clear codes and recheck to see if P0907 resets immediately or only under certain conditions.
2. Verify the complaint and observe live data for the gate select position input (naming varies by vehicle). Look for a value that is fixed, pegged, or implausibly high compared to commanded/actual selector movement.
3. Perform a thorough visual inspection of the gate select position sensor/actuator area and harness routing. Look for chafing, crushed insulation, recent repairs, fluid contamination, and unsecured looms that could contact hot or moving parts.
4. Inspect connectors at the sensor/actuator and at the control module: check for corrosion, moisture, spread terminals, bent pins, and backed-out locks. Correct any pin fit issues before further testing.
5. Key on, engine off: use the scan tool to monitor the gate select position signal while gently moving the harness and connectors (wiggle test). If the reading spikes high or drops out, isolate the exact location and connector that triggers the change.
6. Check the sensor power/reference feed and ground integrity with a multimeter using the wiring diagram. Confirm the feed is present and stable, and confirm the ground path is capable of carrying load; do not rely on continuity alone.
7. Perform voltage-drop testing on the ground circuit between the sensor ground pin and the known-good ground point while the circuit is loaded (method varies by vehicle). Excessive drop indicates resistance in wiring, terminals, or ground connections that can bias the signal high.
8. Test for short-to-power on the signal circuit. With the sensor disconnected (and module side tested as directed by service information), check whether the signal wire shows unintended voltage or continuity to a power/reference source. If it does, locate the chafe/short point in the harness.
9. Check for signal-to-reference or signal-to-feed cross-short by isolating the harness sections (unplug intermediate connectors if present). If the fault disappears when a segment is separated, the short is within the isolated segment.
10. If wiring, connectors, power, and grounds test good, evaluate the gate select position sensor/actuator. Compare the live signal response to selector movement (where applicable) and verify it is not stuck high. Replace only if testing indicates the sensor output is incorrect per service information.
11. If all external components and circuits are verified good and the signal at the module pin is still interpreted as high, follow service information for control module pin-tension checks and input circuit diagnosis. Consider module faults only after eliminating wiring/sensor causes.

Professional tip: When chasing a “circuit high” fault, prioritize finding unintended voltage on the signal line and proving ground integrity under load. A clean-looking connector can still have poor pin tension or hidden corrosion; confirm by measuring voltage drop and by logging live data during a controlled wiggle test so you can correlate signal spikes with a specific harness movement or connector touch point.

Possible Fixes & Repair Costs

Repair costs for P0907 vary widely because the fix depends on what is driving the Gate Select Position Circuit High condition on your vehicle. Total cost is influenced by diagnostic time, harness accessibility, connector condition, and whether a sensor, actuator, or control module issue is confirmed by testing.

• Repair damaged wiring in the gate select position signal circuit (short-to-power, rubbed-through insulation, pinched harness) after confirming with circuit tests
• Clean, repair, or replace affected connectors/terminals (corrosion, moisture intrusion, bent pins, poor terminal tension) and verify stable signal afterward
• Restore proper power and ground integrity to the related sensor/actuator circuit (repair opens, high resistance, or poor ground points) verified with voltage-drop testing
• Replace the gate select position sensor (or integrated position sensing component) only after confirming the circuit is good and the sensor output remains high
• Repair or replace the related shift actuator/selector assembly if position feedback is integrated and proven to be forcing the signal high
• Update or reprogram the control module if service information indicates a calibration issue and all electrical checks pass
• Replace the control module only after verifying powers/grounds, reference circuits, signal wiring, and component behavior are correct and the fault persists

Can I Still Drive With P0907?

Driving with P0907 may be possible, but it depends on how the transmission/shift system reacts when it detects a Gate Select Position Circuit High. Some vehicles may enter a reduced-function mode, limit gear selection, or inhibit shifting to protect the drivetrain. If you notice harsh or unexpected shifts, inability to select gears, a no-start condition, stalling, or any warning that affects braking or steering, do not drive—have the vehicle inspected and repaired. If it drives normally, keep trips short and avoid demanding conditions until the circuit fault is diagnosed.

What Happens If You Ignore P0907?

If ignored, a Gate Select Position Circuit High can lead to repeated warning lights, intermittent or persistent shifting limitations, and the risk of being unable to select the intended gear. Continued operation with incorrect position feedback can increase wear on shift components and may cause more frequent limp-mode events. The underlying electrical issue (such as a short-to-power or connector problem) can also worsen over time, turning an intermittent fault into a hard failure that leaves the vehicle unable to move or start.

Related Gate Select Codes

Compare nearby gate select trouble codes with similar definitions, fault patterns, and diagnostic paths.

• P0908 – Gate Select Position Circuit Intermittent
• P0906 – Gate Select Position Circuit Low
• P0905 – Gate Select Position Circuit Range/Performance
• P0904 – Gate Select Position Circuit
• P0808 – Clutch Position Sensor Circuit High
• P0338 – Crankshaft Position Sensor “A” Circuit High

Key Takeaways

• P0907 indicates an electrical “high input” condition in the gate select position circuit, not a confirmed mechanical failure.
• Most common fault paths involve short-to-power wiring, connector/terminal problems, or power/ground integrity issues.
• Confirm the condition with scan data and circuit testing before replacing any sensor, actuator, or module.
• Wiggle testing and voltage-drop checks help expose intermittent terminal tension and hidden resistance issues.
• Driving impact varies by vehicle; shifting may be limited or inhibited to protect the powertrain.

Vehicles Commonly Affected by P0907

• Vehicles with electronically controlled manual or automated manual transmissions that use gate/selector position feedback
• Vehicles with shift-by-wire systems where a position sensor reports selector/gate status to a control module
• Powertrains using integrated selector assemblies that combine mechanical selection with electrical position sensing
• Platforms with wiring routed near moving shift components, brackets, or heat sources that can chafe insulation
• Vehicles operated in environments that promote connector corrosion or moisture intrusion (varies by location and usage)
• High-mileage vehicles where terminal tension, harness strain relief, or ground points may degrade over time
• Vehicles that have had recent transmission, clutch, or shifter service where connectors or harness routing may have been disturbed
• Vehicles with aftermarket electrical accessories installed near powertrain harness runs (risk depends on installation quality)

FAQ

Is P0907 a sensor failure or a wiring problem?

P0907 only tells you the module detected the gate select position circuit reading “high.” That can be caused by a sensor stuck high, a short-to-power in the signal wire, a missing/poor ground that biases the signal high (design-dependent), or a connector/terminal issue. Testing the circuit and sensor output is required to identify which one it is.

What does “Circuit High” mean for diagnostics?

“Circuit High” points you toward electrical conditions that force the signal higher than expected, such as a short-to-power, an incorrect feed on the signal line, a wiring cross-short, or an open/weak ground that makes the input float high (varies by circuit design). The correct approach is test-driven: verify the signal state, then isolate wiring versus component causes.

Can a bad ground cause P0907?

Yes, depending on the circuit design. A damaged, loose, or high-resistance ground can cause some sensor signals to bias high or become unstable, which may be interpreted as a high input. Ground concerns should be verified with voltage-drop testing under load and by inspecting ground points and terminals for damage or contamination.

Will clearing the code fix P0907?

Clearing P0907 only removes the stored code and resets monitor status; it does not correct the electrical condition. If the underlying high input remains, the code will typically return when the monitor runs again. Use clearing only after repairs, or as part of a controlled test drive with live-data logging to confirm the fix.

Do I need to replace the control module for P0907?

Control module replacement is rarely the first step. Before considering it, verify power and ground feeds to the module, check the gate select position signal circuit for shorts-to-power or connector issues, and confirm the sensor/actuator output behavior. Module replacement should only follow service-information procedures and only after all external causes are ruled out.

Always confirm the final repair by verifying stable gate select position data, ensuring the circuit no longer reads high under the same conditions, and completing a drive cycle so the monitor can run without P0907 returning.