Code
P0A16
Generic
P — Powertrain
Engine Mount A Control Circuit High
Views:
UK: 16
EN: 26
RU: 18
AI status
Completed
Completed
100%
Causes
- Short to battery voltage (VB+) on the engine mount A control circuit
- Faulty engine mount actuator (internal shorted driver or component)
- Corroded or damaged wiring harness or connector (pin pushed out, bent, or contamination)
- Poor or missing ground in the actuator or ECM grounds
- Blown or improperly rated fuse or failed relay in the mount power feed
- Faulty ECM/PCM driver output (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) or related warning illuminated
- Noticeable increased vibration or noise from engine/whole vehicle (reduced NVH performance)
- Active mount may be non‑functional or stuck in one state
- Possible limp/derate behavior if vehicle logic limits systems due to fault
What to check
- Read and record freeze frame and live data with a scan tool (engine mount status/commands)
- Check battery voltage and charging system (low battery can cause false errors)
- Visually inspect actuator connector and wiring for damage, corrosion, or pin issues
- Check fuses and relays related to engine mount power feed
- Measure voltage at the actuator connector with connector attached (backprobe) while commanded
- Measure resistance/continuity of actuator circuit with ignition off (follow service manual)
Signal parameters
- Control signal type: typically ECM driver switching (low‑side or high‑side) or PWM to actuator
- Expected control voltage: approx. 0 V when off; pulses up to battery voltage (≈12 V) when commanded — refer to vehicle service manual for exact waveform
- Actuator coil/driver resistance: low‑ohm value; check manufacturer specification
- Current draw: increases when actuator is driven; compare to specification
- A 'high' circuit fault means measured voltage is higher than expected or an open circuit pulled to VB+
Diagnostic algorithm
- Connect a scan tool, retrieve freeze frame and any related codes; note when the fault sets.
- Verify battery condition and charging system; recharge or replace if voltage is low or unstable.
- Visually inspect the engine mount actuator connector and wiring harness for damage, chafing, or corrosion; repair any damage.
- With ignition ON (engine off) backprobe the actuator connector: check for proper reference and control voltages while commanding the mount on/off from the scan tool. Compare to expected behavior.
- If circuit voltage is stuck high, disconnect actuator connector and re‑measure voltage at the harness side to determine if short to VB+ exists in harness or actuator.
- Measure resistance/continuity of the actuator coil per service manual. If shorted or out of spec, replace the actuator.
- Check supply fuses/relays and ground connections for the mount circuit and for the ECM ground points; repair as needed.
- If harness and actuator test good, suspect ECM driver fault. Confirm with service manual bench tests or consult manufacturer guidance before replacing ECM.
- After repairs, clear codes and road test to confirm the code does not return and that vibration/driveability symptoms are resolved.
Likely causes
- Wiring short to battery voltage at the actuator connector
- Failed active engine mount actuator
- Connector corrosion or poor terminal contact
- Missing ground or high resistance ground at actuator or ECM
- Faulty fuse/relay feeding the mount circuit
Fault status
Status
High voltage detected on Engine Mount A control circuit: circuit voltage above expected threshold. Code stored when abnormal voltage condition is present during self‑test.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P0A16
LAND ROVER
P — Powertrain
Engine mounting control - high circuit
Views:
UK: 7
EN: 13
RU: 8
AI status
Completed
Completed
100%
Causes
- Short to battery voltage (VB+) on the engine mount A control circuit
- Faulty engine mount actuator (internal shorted driver or component)
- Corroded or damaged wiring harness or connector (pin pushed out, bent, or contamination)
- Poor or missing ground in the actuator or ECM grounds
- Blown or improperly rated fuse or failed relay in the mount power feed
- Faulty ECM/PCM driver output (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) or related warning illuminated
- Noticeable increased vibration or noise from engine/whole vehicle (reduced NVH performance)
- Active mount may be non‑functional or stuck in one state
- Possible limp/derate behavior if vehicle logic limits systems due to fault
What to check
- Read and record freeze frame and live data with a scan tool (engine mount status/commands)
- Check battery voltage and charging system (low battery can cause false errors)
- Visually inspect actuator connector and wiring for damage, corrosion, or pin issues
- Check fuses and relays related to engine mount power feed
- Measure voltage at the actuator connector with connector attached (backprobe) while commanded
- Measure resistance/continuity of actuator circuit with ignition off (follow service manual)
Signal parameters
- Control signal type: typically ECM driver switching (low‑side or high‑side) or PWM to actuator
- Expected control voltage: approx. 0 V when off; pulses up to battery voltage (≈12 V) when commanded — refer to vehicle service manual for exact waveform
- Actuator coil/driver resistance: low‑ohm value; check manufacturer specification
- Current draw: increases when actuator is driven; compare to specification
- A 'high' circuit fault means measured voltage is higher than expected or an open circuit pulled to VB+
Diagnostic algorithm
- Connect a scan tool, retrieve freeze frame and any related codes; note when the fault sets.
- Verify battery condition and charging system; recharge or replace if voltage is low or unstable.
- Visually inspect the engine mount actuator connector and wiring harness for damage, chafing, or corrosion; repair any damage.
- With ignition ON (engine off) backprobe the actuator connector: check for proper reference and control voltages while commanding the mount on/off from the scan tool. Compare to expected behavior.
- If circuit voltage is stuck high, disconnect actuator connector and re‑measure voltage at the harness side to determine if short to VB+ exists in harness or actuator.
- Measure resistance/continuity of the actuator coil per service manual. If shorted or out of spec, replace the actuator.
- Check supply fuses/relays and ground connections for the mount circuit and for the ECM ground points; repair as needed.
- If harness and actuator test good, suspect ECM driver fault. Confirm with service manual bench tests or consult manufacturer guidance before replacing ECM.
- After repairs, clear codes and road test to confirm the code does not return and that vibration/driveability symptoms are resolved.
Likely causes
- Wiring short to battery voltage at the actuator connector
- Failed active engine mount actuator
- Connector corrosion or poor terminal contact
- Missing ground or high resistance ground at actuator or ECM
- Faulty fuse/relay feeding the mount circuit
Fault status
Status
High voltage detected on Engine Mount A control circuit: circuit voltage above expected threshold. Code stored when abnormal voltage condition is present during self‑test.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 39
LAND ROVER 2018 Discovery HSE Luxury, 3.0L Eng VIN K
HTML ManualLAND ROVER 2018 Discovery HSE Luxury, 3.0L Eng VIN V
HTML ManualLAND ROVER 2018 Discovery HSE, 3.0L Eng VIN K
HTML ManualLAND ROVER 2018 Discovery HSE, 3.0L Eng VIN V
HTML ManualLAND ROVER 2018 Discovery Sport HSE
HTML ManualLAND ROVER 2018 Discovery Sport HSE Luxury
HTML ManualLAND ROVER 2018 Discovery Sport SE
HTML ManualLAND ROVER 2018 Range Rover Autobiography
HTML ManualWorkshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
