Code
P1159
PEUGEOT
P — Powertrain
Electric throttle signal malfunction
Views:
UK: 0
EN: 3
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty throttle body position sensor(s) (TPS)
- Faulty accelerator pedal position sensor(s) (APP)
- Damaged wiring, pins or connectors between sensors and ECU (opens, shorts, corrosion)
- Poor ground or missing 5 V reference from ECU
- Contaminated or mechanically sticking throttle plate
- ECU internal fault or software calibration error
Symptoms
- Engine enters limp‑in/safe mode with reduced power
- Check Engine Light (MIL) illuminated
- Unstable or high/low idle
- Delayed or erratic throttle response
- Inability to accelerate normally
What to check
- Read freeze frame and scan tool live data for APP and TPS voltages/percentages and correlation values
- Verify battery voltage is stable (normal charging system) before testing
- Visually inspect connectors and wiring for damage, corrosion or loose pins at throttle body, pedal and ECU
- Check for stored related codes (P0120–P0125, P2135, P2106, P2119, etc.)
- Perform a wiggle test on wiring with scan tool monitoring live data to reproduce the fault
- Inspect throttle plate for carbon build‑up or mechanical sticking
Signal parameters
- 5 V reference present at sensor connector (Key ON, engine OFF)
- Typical sensor output voltages: approx. 0.5–4.5 V across operating range (varies by sensor and model)
- Redundant sensors often produce inverse or different slope curves; both must correlate within manufacturer limits
- Closed‑throttle output usually near lower end (~0.5–1.0 V) and wide‑open near upper end (~4.0–4.5 V)
- Response should be smooth and continuous with throttle/pedal movement (no sudden jumps or dropouts)
Diagnostic algorithm
- Connect a capable scan tool, record the DTC, freeze frame and live data for APP and TPS values and any correlation flags.
- With Key ON Engine OFF, check for proper 5 V reference and ground at each sensor connector using a multimeter.
- Backprobe sensor output pins: slowly operate pedal and observe voltages for smooth change; note any missing or jumping signals.
- Check continuity and resistance of wiring between sensors and ECU; inspect for shorts to battery or ground.
- Perform wiggle test on harness and connectors while monitoring live data to find intermittent faults.
- Inspect and clean throttle body and plate if carboned; manually verify throttle plate moves freely (engine off).
- If sensor voltages OK but signals inconsistent or fail correlation checks, replace faulty sensor (pedal or throttle body) per manufacturer procedure.
- After repairs, clear codes and perform throttle adaptation/ECU relearn procedure as specified by Peugeot service instructions; recheck for return of the code.
- If problem persists after sensor and wiring checks, consider ECU diagnostic/repair or software update from dealer.
Likely causes
- Contaminated or failing throttle body sensor (most common)
- Damaged connector or intermittent wiring between throttle/pedal and ECU
- Failed accelerator pedal sensor or mismatch between redundant sensor signals
- Loss of reference voltage or ground to sensor circuit
Fault status
Status
Electric throttle signal malfunction — sensor/wiring/ECU correlation fault detected. Check accelerator pedal and throttle body sensors, wiring and reference/ground; perform adaptation after repair. Do not proceed with repairs without confirming live data and test results.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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