OBD Guide
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P1191

Electronic Throttle System Limp Home Valve On

P1191 is an OBD-II diagnostic trouble code meaning: Electronic Throttle System Limp Home Valve On. Common causes: throttle position sensor malfunction, problems with the throttle motor. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Reduced engine power
  • Unstable engine idling
  • Check Engine light comes on
  • Engine speed limit
  • Acceleration problems

Causes

  • Throttle Position Sensor Malfunction
  • Problems with the throttle motor
  • Open or short circuit in control circuit
  • Throttle valve contamination
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check throttle position sensor
  2. Check the throttle motor
  3. Check the integrity of the wiring harness and connections
  4. Clean throttle body
  5. Check and, if necessary, replace the engine control unit

Related codes

P1190P1192P1120

Error P1191 by Vehicle Brand

BMWBuickCadillacChevroletChryslerFordGMGMCJaguarLincolnMazdaMercuryOldsmobileSaturn

FAQ

What does the P1191 code mean?

P1191 is an OBD-II diagnostic trouble code that indicates: Electronic Throttle System Limp Home Valve On

What causes a P1191 error code?

The most common causes of P1191 include: Throttle Position Sensor Malfunction; Problems with the throttle motor; Open or short circuit in control circuit; Throttle valve contamination.

How do I fix a P1191 diagnostic trouble code?

To fix P1191: Check throttle position sensor. Check the throttle motor. Check the integrity of the wiring harness and connections. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1191?

Limited driving only, diagnose soon

How much does it cost to fix P1191?

The estimated repair cost for P1191 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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