The PCV heater is an electric element of a few ohms (Saab: 6–10 Ω) at the junction of the ventilation hose and the intake; it stops water in the blow-by gas from freezing and blocking the ventilation in frost. The module switches it to ground. P053D means the heater is electrically connected but its effect or current is implausible – current outside the target window, an overheated driver, or the expected warming does not occur. No manufacturer document available to us uses P053D; GM Europe checks this function under P052E. Frost protection is then uncertain.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Symptoms
- Often none, except in frost
- Check engine light (depending on the maker)
- In frost: oil leaks or loss of power from frozen ventilation
Most likely causes
- Heating element aged (resistance outside 6–10 Ω, Saab reference)
- Increased contact resistance at the connector
- Partial short in the element (overcurrent, driver overheating)
- Engine module
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: easy
- It affects emissions.
What each character of P053D means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 5: Speed and idle
- 3D: Specific fault in that system
Frequently asked questions
Can I keep driving with code P053D?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P053D?
The most common causes are: heating element aged (resistance outside 6–10 Ω, Saab reference); increased contact resistance at the connector; partial short in the element (overcurrent, driver overheating).
Related codes
- P053APCV Heater A Control Circuit/Open
- P053BPCV Heater A Control Circuit Low
- P053CPCV Heater A Control Circuit High
- P052EPCV Regulator Valve Performance
- P053ECrankcase Pressure Too High
Sources
- saabwisonline.com: dtc p052e or p053a p053c
- law.cornell.edu: 13 CCR 1968.2
- patents.google.com: US10662836
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.