Powertrain, generic · Hybrid propulsion

P0AAD Hybrid/EV Battery Pack Air Temperature Sensor A Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P0AAD is the plausibility check for battery air temperature sensor A: the signal is electrically valid but does not fit other temperatures. GM documents two methods. In the 2011 and 2013 full-size two-mode hybrid tables, at power-up the inlet air reading may not exceed the outlet air reading by more than 20 °C, checked once per start. In GM's 2013 table (13OBDG05C), after more than 8 hours off the inlet sensor may not differ from the average battery core temperature by more than 10 °C, 50 of 62 samples. Both are Type B, two trips. A sensor stuck at a plausible value, a sensor out of the air stream or a faulty core sensor can cause it. The car keeps running, but fan control and power limits may be wrong.

Likely causes

Thermistor drifted or stuck at a plausible value
Sensor displaced from the air stream or duct blocked
Fault in the comparison sensor (outlet air or cell temperature)

Symptoms

  • Check engine or hybrid warning light
  • Battery cooling fan behaves unusually

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery pack air temp sensor awiring harnessbms

Related codes

P0AACP0AAEP0AAFP0AB2P0A9C

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.