P06AA

Code

Generic P — Powertrain

Control Module Internal Temperature B Too High

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 29 RU: 23

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Actual overheating of the control module due to engine bay heat or blocked airflow
Failed internal temperature sensor or sensor circuit inside the control module
Poor power or ground connections causing internal heating or erroneous readings
Shorted or damaged wiring/connectors to the module
Coolant or coolant-jet failure if module is coolant-cooled (where applicable)
Software/firmware fault or calibration issue in the control module

MIL/Check Engine light illuminated
Stored P06AA (Control Module Internal Temperature B Too High)
Possible reduced engine performance or limp mode depending on manufacturer strategy
Intermittent faults that correlate with high ambient or engine bay temperature
Vehicle may operate normally when cooled and fault may reappear when hot

Read and record freeze-frame data and all stored codes with a capable scan tool
Monitor live internal module temperature B value while cold, at idle, and under load
Inspect module mounting, proximity to heat sources, and any cooling passages
Visually inspect connector for corrosion, bent pins, water ingress, or damage
Verify battery voltage and module ground(s) for proper connections and low resistance
Check for related coolant/engine temperature codes that could indicate cooling system problems

Live internal module temperature B reading from scan tool (units: °C or °F) — should track ambient/engine bay temperature; sudden extreme values indicate fault
Normal operating range typically well below module shutdown threshold (varies by vehicle); repeated readings above manufacturer limit trigger DTC
Module supply voltage (approx. battery voltage 12–14.8 V while running); large deviations can cause erroneous sensor readings
Ground resistance to chassis: low milliohms expected; high resistance suggests poor ground

Capture freeze-frame and note conditions when the code set (ambient temp, engine temp, load). Clear codes and attempt to re-create while monitoring live data.
With a scan tool, monitor the module’s internal temperature B value as the vehicle warms and cools. Note correlation with ambient/engine bay temperature and when code sets.
Visually inspect module and connector for heat damage, water, corrosion, or debris. Secure any loose mounting or shields that might cause heat soak.
Check battery voltage and verify all module power and ground circuits. Repair any loose/corroded connections and re-test.
Perform back-probing or use wiring diagrams to test continuity and resistance on temperature sensor circuits and any related power/ground leads. Repair wiring as required.
If the module is coolant-cooled, verify coolant level, flow, and any cooling passages to the module; repair leaks or blockages before retesting.
If wiring and environment check clean, check for software updates or known module faults. Reflash/update module software if a manufacturer update is available.
If fault persists after wiring, power/ground, and environmental causes are addressed, consider replacing the control module. Program/configure replacement module per manufacturer procedures.
After repair, clear codes and perform a drive cycle to confirm the fault does not return.

Corroded or loose power/ground at the control module
Contaminated or damaged module connector causing false high reading
Restricted airflow or heat source near module (exhaust, turbo plumbing, intercooler piping)
Internal failure of the module’s temperature-sensing circuit