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DTC codes / P0Exx · Hybrid propulsion / P0E42

P0E42Charge Status Indicator B Control Circuit High

P0E42 indicates that the powertrain control module (PCM) has detected a high-voltage condition on the control circuit for charge status indicator B, which is typically a lamp or display that shows the high-voltage battery's state of charge. The PCM expects a certain voltage range on this circuit and sets the code when the signal exceeds the upper threshold, often due to a short to voltage or an open circuit.

SystemPowertrain
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • The charge status indicator may not illuminate at all or may stay on continuously.
  • The high-voltage battery gauge or display may show incorrect or erratic readings.
  • Often no symptoms besides the warning light, as the indicator is informational.
  • Possible reduced electric range or performance if the fault affects battery management.
  • Other warning lights may appear if the issue is related to a broader electrical fault.
  • In some cases, the vehicle may enter a reduced power mode to protect the high-voltage system.

Common causes, most likely first

  1. A short to voltage in the control circuit wiring, such as a chafed wire contacting a power source.
  2. An open circuit or high resistance in the ground path for the indicator.
  3. A faulty charge status indicator bulb, LED, or display unit.
  4. Corrosion or loose pins at the indicator connector or PCM connector.
  5. A malfunctioning PCM driver for the indicator circuit.
  6. Aftermarket accessories improperly wired into the indicator circuit.
  7. Water intrusion into the indicator assembly or wiring harness.

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related codes in other modules.
  2. Inspect the charge status indicator and its connector for visible damage, corrosion, or loose pins.
  3. Measure the voltage on the control circuit at the indicator connector with the key on and compare to specifications.
  4. Check the ground circuit for the indicator using a voltage drop test to ensure it is clean and tight.
  5. Disconnect the PCM and inspect the control circuit for shorts to voltage or opens using a wiring diagram.
  6. If the circuit tests good, substitute a known-good indicator to see if the code changes.
  7. If the indicator and wiring are confirmed good, diagnose the PCM driver circuit or replace the PCM as a last resort.

Charge indicator faults that mislead technicians

  • A short to voltage on the indicator control circuit often comes from aftermarket alarm or remote start wiring tapped into the wrong wire.
  • The charge status indicator may be part of a larger cluster, so a fault in the cluster's power or ground can set this code even if the indicator itself is fine.
  • Some vehicles use a pulse-width modulated signal for the indicator, so a standard voltmeter may not show the expected voltage; an oscilloscope is needed for accurate diagnosis.
  • This code does not always mean the high-voltage battery is failing; it only refers to the indicator circuit, so avoid replacing expensive battery components without proper testing.
  • A weak or failing 12-volt battery can cause erratic behavior in the indicator circuit, so always check the 12-volt system first.

Can I keep driving with P0E42?

The vehicle is generally safe to drive because this code affects only the charge status indicator, not the high-voltage system's operation. However, avoid long trips until the fault is repaired, as you may not have accurate information about the battery's state of charge.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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