Code
C1287
LAND ROVER
C — Chassis
Throttle pedal force switch - circuit failure
Views:
UK: 10
EN: 16
RU: 11
AI status
Completed
Completed
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Causes
- Open or short in throttle pedal force switch wiring
- Corroded, loose or damaged connector at the pedal module or ECU
- Faulty throttle pedal force switch or pedal assembly
- Poor ground or intermittent power supply to the pedal sensor
- Water ingress or contamination of pedal connector
- ECU/PCM input circuit fault or internal module failure
Symptoms
- Dashboard fault indicator or traction/engine warning lamp illuminated
- Reduced engine power or limp-home mode
- Unresponsive, hesitant or inconsistent throttle response
- Stored/active related DTCs for throttle/pedal sensors
- Possible inability to start or immediate limp behavior after code sets
What to check
- Retrieve freeze frame and full DTC list with a capable scan tool; note codes and status
- Visual inspection of pedal module connector, wiring harness routing and for signs of damage, corrosion or water ingress
- Check for Technical Service Bulletins (TSBs) or recall information for pedal/sensor issues
- Inspect fuses and power/ground circuits associated with pedal and throttle ECU
- Use a multimeter/oscilloscope to check reference voltage, signal and ground at the pedal connector
- Perform a wiggle test on harness/connectors while monitoring live data for intermittent changes
Signal parameters
- Reference supply typically 5 V (verify with vehicle wiring diagram before testing)
- Signal output should vary smoothly with pedal force/position (no abrupt jumps or drops)
- Typical signal voltage range ~0.5–4.5 V proportional to pedal force (verify against vehicle-specific data)
- Open-circuit (infinite) indicates broken conductor; near 0 V indicates short to ground; near supply voltage indicates short to V+
- Power and ground continuity should be low resistance (check spec; typically
Diagnostic algorithm
- Connect diagnostic scanner, read DTCs, note freeze frame and related codes. Record live data for pedal force/position and related sensors.
- Perform visual inspection of pedal module, connector and harness for damage, corrosion, water, or pin push-out. Repair any visible issues.
- With ignition on (engine off), measure reference voltage at the pedal connector (verify ~5 V) and check ground continuity to chassis ground.
- Probe the pedal signal lead while operating pedal slowly; observe signal voltage for smooth proportional change. Use oscilloscope if available to check for noise or dropouts.
- If open/short suspected, backprobe and measure continuity from pedal connector to ECU connector; repair or replace damaged wiring if continuity not within expected range.
- If wiring and connectors check good, replace or bench-test the throttle pedal force switch/pedal assembly per manufacturer procedure.
- After repair, clear codes and perform road test or repeat activation to confirm the fault does not reappear and live data is normal.
- If fault persists after replacing pedal and repairing wiring, check ECU input circuits and grounds; consider module replacement only after confirming harness and sensor integrity.
Likely causes
- Damaged wiring harness or chafed insulation between pedal and ECU
- Poor connector contact/corrosion at pedal module
- Defective throttle pedal force switch (internal fault)
- Intermittent ground or supply voltage drop
- Less likely: ECU input failure
Fault status
Status
Throttle pedal force switch circuit failure detected. May cause reduced throttle control or limp-home behavior until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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