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Home / DTC / P2670 — Actuator Supply Voltage B Circuit Low

P2670 — Actuator Supply Voltage B Circuit Low

Detailed page for trouble code P2670.

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Code

P2670

Generic P — Powertrain

Actuator Supply Voltage B Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 14 EN: 17 RU: 15
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Page language: EN

Causes

  • Blown fuse or faulty power/ignition relay supplying the actuator B circuit
  • Low battery voltage or weak/poor battery connection
  • Poor or corroded ground connection for the actuator circuit or PCM ground
  • Open or high-resistance wiring (connector corrosion, broken wire) in the actuator B supply circuit
  • Short to ground on the actuator supply feed
  • Faulty actuator(s) that draw excessive current (internal short)

Symptoms

  • Check Engine MIL illuminated (DTC P2670 stored)
  • Related actuator(s) do not operate or operate intermittently (e.g., solenoids, VVT actuators, valves—vehicle-dependent)
  • Engine runs poorly, rough idle, reduced performance or enters limp mode if critical actuators are affected
  • No-crank or crank issues if supply feeds critical modules (less common)
  • Possible battery voltage warning or dimming accessories when actuator commanded

What to check

  • Read and record freeze-frame and all stored/related DTCs before clearing codes
  • Visually inspect fuses, fusible links and relay for the actuator B circuit
  • Inspect battery terminals and measure battery resting voltage and while cranking
  • Inspect wiring harness and connectors for damage, corrosion, pushed-out pins, or water intrusion at actuator connectors and common junctions
  • Check/clean ECM/ground and engine/chassis grounds related to the supply circuit
  • Back-probe the actuator B supply pin(s) at the connector with ignition ON and engine OFF; note voltage

Signal parameters

  • Expected supply voltage (battery-switched actuator supply): approximately 9–16 V with key ON and engine running (nominal ~12–14.5 V)
  • If circuit is a 5 V reference type, expected reference: ~4.75–5.25 V with ignition ON
  • Voltage drop greater than ~1 V between battery positive and supply pin under load indicates wiring/connection problem
  • Open/short check: continuity to battery power should be low resistance; short-to-ground will show near 0 Ω between supply feed and ground when isolated (use caution)

Diagnostic algorithm

  1. Capture freeze-frame data and scan for other DTCs that may identify which actuator(s) are affected.
  2. Visually inspect fuses, relays and wiring for the actuator B supply circuit; replace any blown fuse and re-test.
  3. Verify battery condition and terminal connections; clean and tighten if needed.
  4. With ignition ON (engine off) back-probe the actuator supply pin at the actuator connector and measure voltage. Record voltage with actuator connected and with it disconnected.
  5. If voltage is low with connector disconnected, trace wiring back to fuse/relay/PCM. Check continuity to the fused power source; repair open/high-resistance wiring or replace fuse/relay.
  6. If voltage is normal with connector disconnected but drops when connected, suspect short or excessive load from the actuator. Measure current draw or substitute a known-good actuator if available.
  7. Inspect and test relevant ground points; repair corroded/loose grounds and re-test.
  8. Repair any damaged wiring, connectors or replace defective actuator(s). After repairs, clear codes and confirm the code does not return during a full drive cycle.
  9. If wiring, grounds, and actuators check good and problem persists, follow manufacturer procedures to test PCM power distribution or consider ECM replacement only after confirming ECM is at fault.
  10. Safety note: isolate battery when doing wiring repairs and use correct test equipment; avoid shorting supply circuits.

Likely causes

  • Blown fuse or bad relay supplying actuator B
  • Loose/corroded battery positive connection or poor chassis/engine ground
  • Damaged connector or wiring harness (pin corrosion, broken conductor) on actuator B supply
  • Short to ground at an actuator or connector
  • Faulty actuator causing excessive current draw

Fault status

⚠️ Status
Actuator Supply Voltage B Circuit Low — the control module has detected the actuator B supply voltage below its expected threshold. This indicates a low-voltage condition in the supply path (wiring, fuse/relay, battery, ground, actuator or module).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P2671 P0562 P0563 P0627 P0628
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