P05C1

Code

Generic P — Powertrain

Active Grille Air Shutter Module B Over Temperature

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 30 RU: 30

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Page language: EN

Causes

Module B internal electronics or motor has overheated
Obstruction or mechanical binding causing motor stall and heat build-up
Shorted motor windings or excessive motor current draw
Poor power/ground connections causing heat in connector or module
High under-hood ambient temperature (cooling system failure, blocked airflow)
Faulty internal temperature sensor or erroneous temperature reading

Symptoms

MIL (Check Engine Light) illuminated with P05C1 stored
Grille shutters stuck open or closed or moving slowly/intermittently
Reduced aerodynamic control / fuel-economy effect due to shutters stuck open
Unusual heat or burning smell near grille area (rare)
Related thermal or cooling system warnings in severe cases

What to check

Read freeze frame and related codes; capture live data for AGAS status, engine coolant temp and ambient air temp
Visually inspect AGAS Module B, shutter linkage and surrounding area for debris, ice, corrosion or physical damage
Inspect connector and wiring for corrosion, bent pins, heat discoloration, melted insulation or water ingress
Command shutters open/close with a scan tool and observe operation and measure response
Measure module supply voltage (should be near battery voltage when key on/run) and check grounds for good continuity
Measure motor current and resistance; check for abnormally high current when commanded (indicates binding or short)

Signal parameters

Module supply voltage: approx. 11–14.5 V (key ON / engine running)
Control input: PWM or switched command from PCM — duty cycle 0–100% (frequency vehicle-dependent); verify with oscilloscope if needed
Motor current: nominal low running current; stalled current will rise significantly (motor-specific, typically single-digit amps to tens of amps)
Internal temperature sensor: typically an NTC or 0–5 V sensor; expected operating range -40°C to ~125°C; over-temperature trip typically above normal operating limit (vehicle-specific, often >100–140°C)
Resistance: motor winding resistance should be low and consistent between runs (consult service data for exact values)

Diagnostic algorithm

Connect a capable scan tool. Read and record P05C1 and any other stored or pending codes. Review freeze frame and live data (AGAS status, coolant temp, ambient temp).
Visually inspect the grille shutter B assembly and linkage for obstruction (debris, ice) and inspect electrical connectors for corrosion or thermal damage.
With ignition ON, measure supply voltage at the AGAS Module B connector and verify a solid ground. Repair any poor connections before further testing.
Use the scan tool to command open/close (or park) the shutters. Observe movement. If movement is sluggish or stalls, check for mechanical binding and remove obstruction or repair linkage.
Measure motor winding resistance and monitor motor current while commanding operation. High current or near-short resistance indicates motor fault or binding. Low/no continuity indicates open winding.
Check the internal temperature sensor signal (voltage/resistance) and compare to ambient and coolant temperatures. If the sensor reads excessively high while ambient/coolant are normal, suspect sensor or module fault.
Inspect wiring harness for shorts to power or ground or chafed insulation. Wiggle-test connectors while monitoring live data for intermittent faults.
If electrical and mechanical systems check good but over-temperature persists, attempt a module reset (clear codes) and retest. If code returns and temperature reading is valid, replace AGAS Module B per manufacturer instructions.
After repair or replacement, perform functional test and road test to confirm correct operation and that code does not recur. Re-scan and verify readiness.