Powertrain
generic / SAE
P2506
ECM/PCM Power Input Signal Range/Performance
The switched-battery input to the ECM/PCM is present, but the level or transient behaviour is out of plausibility — sagging during cranking, slow ramp-up after main-relay close, or noisy. Often caused by aged main relay contacts or a weak battery feed under load.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 06
Possible causes
- Aged main relay contacts with rising contact resistance high
- Weak battery sagging during crank medium
- Sensor element aged beyond calibration window low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: main relay
- Component: power distribution
- Component: battery cables
- MIL / check engine light
Sources
References
sae:J2012