P1135

Code

LAND ROVER P — Powertrain

Accelerator pedal position sensor One

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 28 EN: 60 RU: 23

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Page language: EN

Causes

Open, short or high resistance in APP sensor 1 wiring or connector
Corroded or loose connector pins at the pedal sensor or ECM
Failed accelerator pedal position sensor (sensor 1)
Poor or missing reference voltage (5 V) or ground to the sensor
Intermittent wiring harness damage (pinch, chafe, rodent)
ECM fault or incorrect calibration/software

Symptoms

Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
Poor throttle response or delayed acceleration
Reduced engine power / limp-home mode
Unexpected idle changes or stalling
Stored or intermittent fault codes related to throttle/pedal

What to check

Read stored codes and freeze-frame data with a scan tool; note any related codes (throttle, sensor 2, communication)
Observe live APP sensor 1 and sensor 2 values while slowly pressing and releasing the pedal; check for smooth, proportional change
Visually inspect pedal assembly, connector, wiring harness and ECM connector for damage, corrosion or loose pins
Backprobe connector: verify 5 V reference, sensor signal voltage and ground continuity
Check fuses and power supplies for the throttle/ECM circuits
Wiggle test wiring and connector while monitoring live data to find intermittent faults

Signal parameters

Reference voltage: ~5.0 V (typically 4.75–5.25 V) present at the sensor reference pin
Signal output (sensor 1): varies with pedal travel ~0.5–4.5 V (should change smoothly from rest to full travel)
Ground: near 0 V with good continuity to chassis/ECM ground
Sensor signal difference: sensor 1 and sensor 2 should correlate; large mismatch indicates sensor/harness fault
Open-circuit: signal may read battery voltage or no voltage if shorted/open

Diagnostic algorithm

Connect a capable scan tool, read PIDs, DTCs and freeze frame; record APP sensor 1 and sensor 2 readings at key positions.
Visually inspect pedal, connector and harness for damage, corrosion or water ingress; repair obvious issues.
With ignition ON (engine OFF), backprobe the sensor connector: confirm 5 V reference, signal voltage and ground continuity.
Slowly operate pedal while watching live sensor voltages. Verify smooth, proportional change in sensor 1 and check correlation with sensor 2.
If reference or ground is missing or out of range, trace wiring to fuse/ECM and repair wiring or replace blown fuse.
If signal is stuck, intermittent, or out-of-range with good reference/ground, disconnect sensor and check for wiring short to battery/ground using an ohmmeter/voltmeter.
Perform wiggle tests on harness and connectors to replicate intermittent faults; repair or replace damaged wiring as found.
If wiring and power/ground are good but sensor 1 is faulty (does not change or outputs incorrect voltage), replace the accelerator pedal position sensor assembly.
After repair, clear codes and perform functional test/road test to verify proper operation and that the code does not return.
If faults persist after sensor and harness replacement, consider ECM diagnosis or software/calibration update at dealer level.

Likely causes

Damaged or disconnected sensor connector
Short to voltage or short to ground on sensor signal wire
Failed APP sensor 1
Bad ground or blown fuse supplying sensor/ECM
Sensor correlation fault between sensor 1 and sensor 2 (redundancy mismatch)

Fault status

⚠️ Status

P1135 — Accelerator Pedal Position Sensor One: circuit/signal fault or invalid data detected by ECM; possible sensor, wiring, connector or power/ground issue.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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P1135 — Accelerator pedal position sensor One