OBD Guide
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P1691

Fuel Injection Pump Controller Calibration Error

P1691 is an OBD-II diagnostic trouble code meaning: Fuel Injection Pump Controller Calibration Error. Common causes: fuel injection pump controller malfunction, wiring harness damage. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Unstable engine operation
  • Power reduction
  • Increased fuel consumption
  • Difficulty starting the engine
  • Check Engine Light Is On

Causes

  • Fuel injection pump controller malfunction
  • Wiring harness damage
  • Problems with ECU software
  • Corrosion or poor contact in connectors
  • Malfunction of the injection pump itself

How to Fix

  1. Check the condition of the wiring harness and connectors
  2. Check the functionality of the fuel injection pump controller
  3. Update ECU software
  4. Replace the injection pump controller if necessary

Related codes

P1690P1692P1693

Error P1691 by Vehicle Brand

BuickCadillacChevroletChryslerDodgeGMGMCJeepMazdaOldsmobilePlymouthPontiacSaturnVolkswagen

FAQ

What does the P1691 code mean?

P1691 is an OBD-II diagnostic trouble code that indicates: Fuel Injection Pump Controller Calibration Error

What causes a P1691 error code?

The most common causes of P1691 include: Fuel injection pump controller malfunction; Wiring harness damage; Problems with ECU software; Corrosion or poor contact in connectors.

How do I fix a P1691 diagnostic trouble code?

To fix P1691: Check the condition of the wiring harness and connectors. Check the functionality of the fuel injection pump controller. Update ECU software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1691?

Yes, but get it checked soon

How much does it cost to fix P1691?

The estimated repair cost for P1691 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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