Code
P07E9
Generic
P — Powertrain
Transmission Range Control A Circuit Performance
Views:
UK: 14
EN: 40
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or short in TR sensor A wiring (to power, signal, or ground)
- Poor or intermittent connector contact (corrosion, bent pins, water intrusion)
- Failed transmission range/shift position sensor A (potentiometer or Hall sensor)
- Mechanical misalignment or internal transmission linkage fault preventing correct sensor movement
- PCM input circuit fault or software/calibration error
- Contamination or damage to sensor from fluid or debris
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (CEL)
- Transmission may go into limp/limited shift mode
- Incorrect gear indicator or incorrect gear selection behavior
- Vehicle may not start unless in Park/Neutral (safety interlock behavior)
- Harsh, delayed or failed shifts, or inability to select certain gears
- Intermittent loss of drive or erratic shifting
What to check
- Read DTCs and freeze frame data with a scan tool; note conditions when code set (engine temp, battery voltage, gear selected)
- Check for additional transmission or communication codes (CAN bus) that may affect diagnosis
- Visual inspection of wiring harness and connectors from sensor to PCM for damage, corrosion, fluid contamination or loose retention
- Backprobe and measure sensor reference voltage, signal voltage and ground at the connector with key ON (engine off)
- Monitor live TR sensor A signal while moving gear selector through all positions (should change predictably or step through defined values)
- Wiggle test wiring while monitoring live data to reveal intermittent opens/shorts or connector faults
Signal parameters
- Reference (supply) voltage: typically ~5.0 V (check vehicle spec)
- Sensor signal voltage: varies by gear position; should transition stepwise or smoothly between ~0.0–5.0 V depending on sensor type
- Signal behavior: consistent, repeatable steps or sweep as selector is moved; no intermittent dropouts or sudden spikes
- Sensor resistance (if potentiometer type): manufacturer-specific but should change smoothly without open circuits or erratic jumps
Diagnostic algorithm
- Verify code and record freeze-frame/live data. Scan for related codes (CAN, power, ground issues).
- Visually inspect connector(s) and wiring to the TR sensor A for damage, corrosion, or fluid intrusion; repair as needed.
- With key ON (engine off), backprobe sensor connector: confirm reference voltage (≈5 V), ground (≈0 V) and measure signal voltage. Compare against expected change while moving selector. If no reference or ground, trace to fuse/PCM and repair.
- If reference and ground present but signal is stuck, shorted, or erratic, test continuity between sensor signal pin and PCM input; check for shorts to 5V or ground.
- If wiring checks good, remove and bench-test or replace TR sensor A (measure resistance sweep or output voltage while moving sensor).
- Inspect and verify mechanical linkage and sensor mounting for correct alignment and free movement; repair or adjust as required.
- If wiring and sensor test good, inspect PCM grounds and power supplies. Consider subscribing to manufacturer TSBs/calibrations; perform PCM reprogram/replace only after ruling out wiring/sensor.
- Clear codes and road-test to confirm repair. Monitor live data for intermittent faults and re-check for reoccurrence.
Likely causes
- Connector corrosion or bent terminal at sensor or PCM
- Broken/chafed wire or short to battery/ground
- Failed transmission range (TR) sensor A
- Sensor out of position due to linkage issue or mounting damage
Fault status
Status
Transmission Range Control A Circuit Performance — PCM detected out-of-range or inconsistent TR sensor 'A' signal (wiring, sensor, mechanical or PCM fault possible).
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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