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Home / DTC / P0E42 — Charge Status Indicator B Control Circuit High

P0E42 — Charge Status Indicator B Control Circuit High

Detailed page for trouble code P0E42.

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Code

P0E42

Generic P — Powertrain

Charge Status Indicator B Control Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 12 EN: 18 RU: 16
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Page language: EN

Causes

  • Open, short to voltage or short to another circuit in the indicator B wiring
  • Corroded, loose or damaged connector at indicator, instrument cluster or control module
  • Faulty charge status indicator (lamp/LED/instrument cluster) or internal driver
  • Faulty control module or damaged module output transistor
  • Intermittent wiring fault due to chafing, pinched harness or water ingress
  • Improper repairs or aftermarket equipment tied into the circuit

Symptoms

  • Charge indicator lamp/LED B on dash illuminated, stuck on, or showing incorrect state
  • Related hybrid/electric charge-status messages or warnings displayed
  • Possible fail-safe behavior of charging system (reduced functionality) depending on vehicle
  • Diagnostic trouble code stored and possibly other related codes
  • Intermittent or permanent malfunction of indicator B

What to check

  • Read stored codes and freeze-frame data with a scan tool; record any related codes
  • Visually inspect wiring and connectors for the indicator B circuit, instrument cluster, and control module
  • Check connector terminals for corrosion, bent pins, or pins pushed out
  • Measure voltage at the indicator B connector with key on/engine off and while operating relevant functions
  • Back-probe the control module output pin and compare to expected signal voltage
  • Perform wiggle test on wiring harness and connectors while monitoring signal to reproduce fault

Signal parameters

  • Expected control-signal range: approximately 0–5 V logic level (varies by vehicle).
  • High/abnormal: voltage consistently near battery/ignition voltage or above normal upper limit (e.g., >4.5 V) when circuit should be low/open.
  • Low/normal: near 0 V when the output is commanded low or open-collector state.
  • Open-circuit condition may read as pulled up to supply voltage; short-to-voltage will show battery/ignition voltage at connector.

Diagnostic algorithm

  1. Confirm code P0E42 is current or stored and note freeze-frame data. Check for other related P0Ex or U0xxx codes.
  2. Inspect connectors and wiring for damage, corrosion, or water; repair any visible issues before further testing.
  3. With ignition ON (engine off), back-probe the indicator B circuit at the instrument cluster and at the control module pin. Measure steady-state voltage. Document readings.
  4. Command the charge-status indicator B on/off (if bidirectional control available via scan tool) while monitoring voltage to see if the output changes correctly.
  5. If voltage is high at the indicator connector but low at the module output, suspect harness short-to-voltage between module and indicator; isolate and repair wiring.
  6. If voltage is high at the module output, disconnect the indicator/cluster connector and re-check the module pin. If still high, suspect module internal fault and consider module replacement or repair.
  7. If voltage changes correctly at the module but the indicator does not respond when connected, inspect/replace the indicator or instrument cluster.
  8. After repairs, clear codes and perform functional test and short road test or cycle to verify the fault does not return.
  9. Safety note: if vehicle has high-voltage hybrid/electric systems, follow manufacturer HV safety procedures and disable HV system before accessing high-voltage components or wiring.

Likely causes

  • Connector pin pushed out or corrosion causing high resistance and a pull-up to reference voltage
  • Wire shorted to battery positive or another high-voltage source feeding the indicator circuit
  • Failed indicator circuit inside the instrument cluster (stuck high)
  • Control module output stage failed and is sourcing voltage instead of being open/low
  • Broken ground or missing reference return causing the module to see a high voltage

Fault status

⚠️ Status
Control circuit voltage for Charge Status Indicator B is higher than allowed by the control module. The module detected an over-voltage/high signal on the indicator B output circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0E40 P0E41 P0E43 P0E44 P0E4A
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