PCV Heater A Control Circuit Low
What it means
P053B means the positive crankcase ventilation (PCV) heater control circuit is reading low voltage — typically a short-to-ground, an open, or a failed heater element. The PCV heater keeps the valve from freezing in cold weather. The engine usually runs normally, so the main concern is in freezing conditions where an unheated PCV valve can ice up, which is why it is best fixed before winter.
Can I keep driving? Usually drivable — the PCV heater mainly prevents the valve from icing in cold weather, so the biggest risk is in freezing conditions; have it repaired before winter.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no change in how the engine runs in mild weather
- In very cold conditions the PCV valve could ice up, risking rough running or oil-seal issues
Common causes
Most likely first
- PCV heater control circuit shorted to ground or open (low voltage)Likely
- Faulty PCV heater element/assemblyCommon
- Damaged or corroded wiring or connectorCommon
- Fault in the ignition (start/run) power feed to the heaterLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the PCV heater wiring and connector for a short-to-ground or open.
- Measure the PCV heater element's resistance against the service spec.
- Confirm the heater's power feed is present with the ignition on.
- Replace the PCV heater assembly if the element is faulty, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P053B?+
Can I just clear P053B?+
Related codes
Often seen with P053B
Read & clear P053B yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.