OBD Guide
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P157A

Sensor Supply Voltage Relay Feedback Circuit High Voltage

P157A is an OBD-II diagnostic trouble code meaning: Sensor Supply Voltage Relay Feedback Circuit High Voltage. Common causes: faulty sensor power relay, short circuit in the circuit. Estimated repair cost: $6–33.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Check Engine Light Is On
  • Incorrect operation of sensors
  • Possible problems starting the engine
  • Reduced engine power
  • Unstable engine operation at idle

Causes

  • Faulty sensor power relay
  • Short circuit in the circuit
  • Wiring harness damage
  • Problems with the engine control unit (ECU)
  • Contact corrosion

How to Fix

  1. Check the sensor power relay
  2. Inspect the wiring harness for damage
  3. Check circuit for short circuit
  4. Clean contacts from corrosion
  5. If necessary, replace the relay or wiring

Related codes

P157BP1579P1580

FAQ

What does the P157A code mean?

P157A is an OBD-II diagnostic trouble code that indicates: Sensor Supply Voltage Relay Feedback Circuit High Voltage

What causes a P157A error code?

The most common causes of P157A include: Faulty sensor power relay; Short circuit in the circuit; Wiring harness damage; Problems with the engine control unit (ECU).

How do I fix a P157A diagnostic trouble code?

To fix P157A: Check the sensor power relay. Inspect the wiring harness for damage. Check circuit for short circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P157A?

Limited driving only, diagnose soon

How much does it cost to fix P157A?

The estimated repair cost for P157A is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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