Volvo APM Fault Codes – Complete OEM Guide, Causes, Symptoms & Solutions

 

Volvo APM Fault Codes – Complete OEM-Style Guide (FH/FM)

Modern Volvo FH/FM trucks use an advanced Air Processing Module (APM), electronic parking brake, and integrated air pressure management. When a fault occurs, the system stores Diagnostic Trouble Codes (DTCs). This OEM-style guide organizes key APM, air system, parking brake, MCU, network, ECM, and battery codes for fast, workshop-friendly diagnostics.

   

---

1. APM (Air Processing Module) Fault Codes

The APM controls airflow, parking brake load/exhaust valves, and related solenoids. Typical issues include general electrical failures, unexpected operation, and solenoid malfunctions.

Code	Description
C100001	Electronic parking brake, load valve, electromagnet – general electrical failure
C100101	Airflow control solenoid valve – general electrical failure
C100201	Airflow control system, regulator, solenoid valve – general electrical malfunction
C100294	Airflow control system, regulator, solenoid valve – unexpected operation
C100301	Electronic parking brake, exhaust valve, electromagnet – general electrical failure
C100401	Electronic parking brake, chassis status control valve, electromagnet – general electrical failure

---

Volvo-EC210D-auto-idle-not-working-fix.

2. Parking Brake & Air Pressure System Fault Codes

2.1 Parking Brake Circuit & Pressure Sensor

Code	Description
C100801	Parking brake control pressure sensor – general electrical failure
C100864	Parking brake control pressure sensor – signal error
C101D62	Parking brake circuit – signal comparison error
C101D7A	Parking brake circuit – fluid leak or seal failure
C101D7B	Parking brake circuit – low fluid level

2.2 Air Pressure System & Brake Circuits

Code	Description
C100601	Power circuit 1, air pressure sensor – general electrical failure
C100701	Power circuit 2, air pressure sensor – general electrical failure
C100A7A	Control valve pressure – fluid leak or seal failure
C100C64	Air pressure system – signal error
C100C7A	Air pressure system – fluid leak or seal failure
C100C7B	Air pressure system – low fluid level
C100D7B	Air supply pressure, front brake circuit – low fluid level
C100E7B	Air pressure, rear brake circuit – low fluid level
C100F62	Front and rear brake circuit – signal comparison error
C102668	Vehicle air pressure system – event information
C10267A	Vehicle air pressure system – fluid leak or seal failure

---

https:/Common mistakes auto technicians make.

3. Humidity Control, Air Pump & Regeneration Valves

Code	Description
C101024	Humidity control system – continuously high signal
C101068	Air humidity monitoring system – event information
C101164	Air pump – signal error
C101268	Air dryer – event information
C101512	Control valve / regeneration, high side, electromagnet – short circuit to battery voltage
C101513	Control valve / regeneration, high side, electromagnet – open circuit
C101612	Load valve / exhaust valve / status control, high side, electromagnet – short circuit to battery voltage
C101613	Pressure valve / exhaust valve / status control, high side, electromagnet – open circuit
C101862	Trailer control circuit – signal comparison error

---

Volvo-EC210D fuel system.

4. Manual Control Unit (MCU) & Pressure Control

4.1 Manual Control Unit (Parking Brake Control)

Code	Description
C101F11	Manual control unit – short circuit to ground
C101F12	Manual control unit – short circuit to battery voltage
C101F1C	Manual control unit – voltage out of range in the circuit
C101F28	Manual control unit – offset signal level out of range / zero adjustment error
C101F45	Manual control unit – program memory failure
C101F49	Manual control unit – internal electronics failure
C101F54	Manual control unit – no calibration
C101F64	Manual control unit – signal error
C101F86	Manual control unit – invalid signal
C101F87	Manual control unit – missing message
C102316	Manual control unit, supply voltage circuit – voltage below threshold
C102317	Manual control unit, supply voltage circuit – voltage above threshold

4.2 Pressure Limiters, Control Valves & ADR Input

Code	Description
C102172	Pressure limiter actuator – stuck open
C102472	Pressure control valve actuator – stuck open
C102473	Pressure control valve actuator – stuck closed
C102474	Pressure control valve actuator – slippage
C102503	ADR input signal circuit – FM/PWM failure
C102511	ADR input circuit – short circuit to ground
C102512	ADR input circuit – short circuit to battery voltage
C102527	ADR input signal circuit – exceeding threshold signal rate of change
C102768	Appointment of the parking brake – event details

---

5. Sensors, Thermistors & Pressure Feedback

Code	Description
C102A01	Parking brake pressure sensor – general electrical fault
C102A64	Parking brake pressure sensor – signal error
C102B01	Thermistor – general electrical fault
C102B55	Thermistor – not configured

---

6. CAN, LIN & Auxiliary Control Unit Fault Codes

6.1 CAN Chassis Network

Code	Description
U002849	CAN communication network chassis – internal electronics failure
U002886	CAN communication network chassis – invalid signal
U002887	CAN communication network chassis – missing message
U002888	CAN communication network chassis – bus disabled

6.2 Manual & Auxiliary Control Communication

Code	Description
U114708	Manual control unit, backlight data transmission circuit – signal/message disturbances on the bus
U114808	Manual control unit, indicator circuit – signal/signal disturbance
U114913	Redundant power supply – open circuit
U114A47	Auxiliary control unit – microcontroller monitoring / security system failure
U114A68	Auxiliary control – event information
U114A94	Auxiliary control unit – unexpected operation

6.3 LIN12 Communication Network

Code	Description
U114B01	LIN12 communication network – general electrical failure
U114B49	LIN12 communication network – internal electronics failure
U114C68	DTC notification upper limit – event information

---

7. ECM (Electronic Control Module) Fault Codes

Code	Description
U300041	Electronic control module – total checksum error
U300044	Electronic control module – data memory failure
U300045	Electronic control module – program memory failure
U300046	Electronic control module – calibration/parameter memory failure
U300049	Electronic control module – internal electronics failure
U30004A	Electronic control module – incorrect component installed
U30004B	Electronic control module – overheat
U300054	Electronic control module – no calibration
U300055	Electronic control module – not configured
U300094	Electronic control module – unexpected operation

---

8. Battery Power Circuit Fault Codes

Code	Description
U300313	Battery power – open circuit
U300316	Battery power circuit voltage – below threshold
U300317	Battery power circuit voltage – above threshold

---

Conclusion

This OEM-style Volvo FH/FM APM and air system fault-code reference helps technicians quickly identify electrical, pneumatic, communication, and ECM-related issues. Use these codes together with live data, visual inspection, and OEM procedures to confirm root cause before replacing components.

`