P0658

Code

Generic P — Powertrain

Actuator Supply Voltage A Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 29 EN: 64 RU: 53

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Weak or discharged battery or poor battery connection
Corroded, loose or damaged fuse or relay in the actuator supply circuit
Open or high-resistance wiring between battery/ignition-switched source and actuator supply (broken wire, chafe, connector corrosion)
Short to ground on the actuator supply wire or at an actuator connector
Faulty actuator(s) drawing excessive current or shorted to ground
Poor ground(s) for the engine control module or actuator bank

Symptoms

Malfunction Indicator Lamp (MIL) or check engine light illuminated
Related actuators (solenoids, valves, turbo bypass, variable valve or fuel control actuators depending on vehicle) fail to operate or operate intermittently
Engine may go into limp mode or experience reduced performance
Starting problems or rough running if key actuators cannot operate
Stored DTC(s) related to affected actuators or supply circuits

What to check

Read freeze frame and freeze data with a scan tool to capture conditions when the code set
Verify battery voltage at rest and during cranking (normal should be ~12.4–12.8 V at rest, 13.5–14.7 V with engine running)
Inspect fuses and relays related to actuator power; check for corrosion and proper seating
Visually inspect wiring harness, connectors and actuator plugs for damage, corrosion, pins pushed out or water intrusion
Backprobe actuator supply pin A with key ON and measure voltage at the actuator connector
Measure voltage at the ECM/PCM actuator supply terminal (refer to wiring diagram)

Signal parameters

Expected supply voltage (key ON, engine OFF): approximately battery voltage, typically 11.5–14.5 V
Expected supply voltage (engine running): approx. 13.5–14.7 V if charging system is healthy
Voltage judged low: circuit voltage significantly below battery (often
Ground circuit resistance: typically
Harness resistance between battery and actuator supply: very low, normally

Diagnostic algorithm

Verify DTC and freeze-frame: confirm P0658 is current or historic; note vehicle conditions (battery voltage, load, engine state).
Check battery and charging system: test battery state-of-charge, battery terminals and alternator output. Correct any battery/charging issues first.
Inspect fuses/relays: locate and inspect fuse(s)/relay(s) supplying actuator bank A. Replace or test relay and fuse; ensure good contact and no corrosion.
Visual harness/connector inspection: follow wiring diagram to trace supply circuit from fuse/relay/battery to actuator A and ECM. Look for damaged insulation, burns, pin corrosion, or water entry.
Voltage measurement: backprobe the actuator supply (pin A) with key ON (engine off) and with engine running; compare to battery. If voltage is low at the connector but normal at fuse, suspect wiring/connector between them.
Check for short to ground or overcurrent: with power off, measure resistance from supply wire to ground and to battery +; check for near-short. Use clamp meter to measure current when circuit powered to identify an overcurrent draw (faulty actuator).
Wiggle/connect test: with voltage monitored, wiggle harness and connectors to reproduce dropouts or changes in voltage, indicating intermittent wiring fault.
Test grounds: verify ground continuity and low resistance from ECM and actuator grounds to chassis/battery negative.
Isolate actuators: disconnect actuators on supply A one at a time and re-check supply voltage — if voltage returns to normal when an actuator is disconnected, that actuator is likely shorted/defective.
ECM/PCM check: if wiring and actuators are good and supply at ECM connector is incorrect, consult wiring diagram and consider ECM/PCM internal supply/driver fault; confirm with manufacturer data or bench test before replacement.
Repair and verify: repair wiring/connectors, replace faulty fuse/relay/actuator/module as indicated, clear codes and road-test to confirm code does not return.

Likely causes

Blown/loose fuse or failed relay supplying actuator bank
Corroded connector pin or water intrusion at actuator harness connector
Damaged harness near moving parts or heat source causing short/high resistance
Weak battery or poor chassis ground connection causing voltage drop
Faulty actuator (shorted coil) pulling the supply low

Fault status

⚠️ Status

Actuator Supply Voltage A Circuit Low (P0658) — control module detected low voltage on actuator supply A. Fault stored and MIL may be illuminated. Check battery/charging, fuses/relays, wiring, grounds and actuators. Replace or repair faulty components and verify repair.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Brands with available manuals

9,530

The library contains 9,530 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

1,243

479

206

456

193

207

138

371

229

155

278

280

166

856

296

406

136

2,209

131

626

221

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