OBD Guide
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P1021

Engine Oil Control Valve Circuit Bank 1

P1021 is an OBD-II diagnostic trouble code meaning: Engine Oil Control Valve Circuit Bank 1. Common causes: open or short circuit in oil control valve circuit, oil control solenoid valve malfunction. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Increased fuel consumption
  • Rough engine idling
  • Difficulty starting the engine

Causes

  • Open or short circuit in oil control valve circuit
  • Oil control solenoid valve malfunction
  • Problems with the wiring harness or connectors
  • Low or poor quality engine oil
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check the level and condition of the engine oil
  2. Check the integrity of the circuit and connectors of the oil control valve
  3. Check oil control valve resistance
  4. Replace oil control valve if necessary
  5. Reset the error code and check if it returns

Related codes

P1020P1022P1023

FAQ

What does the P1021 code mean?

P1021 is an OBD-II diagnostic trouble code that indicates: Engine Oil Control Valve Circuit Bank 1

What causes a P1021 error code?

The most common causes of P1021 include: Open or short circuit in oil control valve circuit; Oil control solenoid valve malfunction; Problems with the wiring harness or connectors; Low or poor quality engine oil.

How do I fix a P1021 diagnostic trouble code?

To fix P1021: Check the level and condition of the engine oil. Check the integrity of the circuit and connectors of the oil control valve. Check oil control valve resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1021?

Yes, but get it checked soon

How much does it cost to fix P1021?

The estimated repair cost for P1021 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat