Powertrain, generic · Vehicle speed, idle control and auxiliary inputs
P053D PCV Heater A Performance
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo
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.
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
Symptoms
- Often none, except in frost
- Check engine light (depending on the maker)
- In frost: oil leaks or loss of power from frozen ventilation
Repair estimate
DifficultyEasyDIY possible
Parts and labour€30–250
Time0.3–1.5 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
pcv heaterheater wiringengine control module
Related codes
References: saabwisonline.com, law.cornell.edu, patents.google.com.