P2135

Code

LAND ROVER P — Powertrain

Throttle Position Sensor A - Voltage Correlation

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 36 EN: 187 RU: 56

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Page language: EN

Causes

Faulty throttle position sensor (TPS) or dual sensor inside throttle body
Damaged, corroded or loose connector or wiring (open, short to ground or +B, poor contact)
Poor or intermittent 5V reference or ground at the sensor
Contamination or mechanical damage to the throttle body
PCM/ECU fault or software anomaly (less common)
Aftermarket modifications or incorrect replacement parts

Symptoms

Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
Reduced engine power or 'limp' mode
Poor or delayed throttle response, hesitation or surging
Unstable or high idle, possible stalling
Throttle pedal position not matching engine response

What to check

Retrieve freeze frame data and full DTC list with a scan tool; note conditions when code set
Check live data: compare TPS A and TPS B voltages/percent values while slowly moving throttle from closed to wide open
Visually inspect throttle body connector and wiring for corrosion, damage, pin push-back or moisture
Verify battery voltage and PCM grounds; check for blown fuses affecting sensor 5V reference
Perform wiggle test on wiring harness while monitoring live TPS signals for intermittent changes
Use a DVOM or oscilloscope to confirm sensor output voltages and the 5V reference and ground integrity

Signal parameters

5V reference present at TPS connector (nominal ~5.0 V)
Sensor outputs typically ~0.5–1.0 V at closed throttle, rising to ~4.0–4.5 V at wide open (varies by design)
TPS A and TPS B should track closely; expected delta typically
No sudden jumps, dropouts or opposite-direction movement between the two sensor signals

Diagnostic algorithm

Connect a compatible scan tool, read DTCs and freeze-frame data. Note engine conditions when fault set.
Visually inspect throttle body connector, wiring harness and PCM connector for damage, corrosion or loose pins; repair as needed.
With ignition ON (engine OFF), backprobe TPS connector: verify 5V reference and ground are steady. If 5V missing/erratic, trace power supply/fuse and PCM reference.
With engine running or during key-on throttle sweep, monitor live TPS A and TPS B voltages. Slowly open/close throttle and confirm both signals increase smoothly and correlate closely.
If voltages do not correlate, use an oscilloscope to compare waveforms for noise, dropouts or inconsistent scaling. Perform wiggle test on harness while monitoring.
If wiring and power/ground are good but outputs still mismatch, bench-test or replace the throttle body / TPS assembly per manufacturer procedure.
After repair, clear codes and perform a road test or drive cycle to confirm the fault does not return. If code persists with good wiring and new sensor, investigate PCM/software update or replacement.

Likely causes

Failed TPS within the throttle body (most common)
Open/short/corroded wiring or connector causing inconsistent sensor voltages
Poor ground or 5V reference supply to the sensor
Intermittent connection due to vibration or pin damage

Fault status

⚠️ Status

P2135 - Throttle Position Sensor A voltage correlation fault. PCM detected a mismatch between TPS sensor outputs; possible sensor, wiring, or reference/ground issue.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P2135 — Throttle Position Sensor A - Voltage Correlation