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Home / DTC / P0E16 — Hybrid/EV Battery Pack Coolant Heater B Control Circuit/Open

P0E16 — Hybrid/EV Battery Pack Coolant Heater B Control Circuit/Open

Detailed page for trouble code P0E16.

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Code

P0E16

Generic P — Powertrain

Hybrid/EV Battery Pack Coolant Heater B Control Circuit/Open

Brand: Generic
Type: P — Powertrain
Views: UK: 20 EN: 37 RU: 24
AI status
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Page language: EN

Causes

  • Open or broken wiring in heater B control circuit
  • Faulty or disconnected connector(s) at the heater or relay/module
  • Failed battery pack coolant heater element (open internally)
  • Blown fuse or faulty relay in the heater supply/control circuit
  • Faulty battery/thermal control module or driver output
  • Corrosion, pin damage, or poor ground connection

Symptoms

  • Battery pack coolant heater B does not switch on when commanded
  • HV/Hybrid system battery warming takes longer or fails in cold ambient temps
  • Battery thermal management warning or check hybrid/EV system lamp illuminated
  • Reduced charge acceptance or limited power in cold conditions
  • Stored DTC and possible reduced system performance mode

What to check

  • Retrieve freeze frame and related DTCs with a scan tool; verify P0E16 is current or stored
  • Visually inspect wiring, connectors, and harness for damage, corrosion, or loose pins at heater, relay/fuse box, and battery pack control module
  • Inspect fuses and relays related to battery coolant heater circuits
  • Use scan tool to command Heater B ON (active test) and observe status and current draw if supported
  • Measure voltage at heater control connector while commanded ON and OFF (see safety note below)
  • Check continuity/resistance of the heater element between its power and ground terminals (with service disconnect per safety procedures)

Signal parameters

  • Commanded state: control module will request heater ON or OFF (use scan tool active test)
  • When commanded ON: supply voltage present at the heater feed (may be 12V or high-voltage depending on vehicle design) — refer to service manual for expected voltage
  • When commanded OFF: near 0 V or open depending on circuit design
  • Heater element resistance: should show continuity; an open/infinite resistance indicates internal heater open (typical expected resistance is low — consult vehicle-specific manual)
  • Current draw when ON: measurable expected current per vehicle spec; no current implies open circuit or blown fuse/relay

Diagnostic algorithm

  1. Safety first: follow manufacturer high-voltage (HV) safety procedures. Only qualified technicians should access HV components. Disable service/traction battery per manufacturer instructions before performing hands-on tests that require isolation.
  2. Connect a professional scan tool and read stored and pending codes. Note freeze frame, battery temperature, and command status for Heater B.
  3. Perform an active test (command Heater B ON) with a scan tool. Observe whether the control module reports heater commanded and heater status change.
  4. Visually inspect all related connectors, wiring harnesses, fuses, and relays from the control module to the heater element and to the battery pack. Repair or replace damaged connectors or harness sections.
  5. With the vehicle made safe per HV procedures, measure resistance/continuity of the heater element at the heater connector and at the pack side. Infinite resistance = open heater element.
  6. With HV disabled per procedures, check continuity of control/ground circuits back to the module/relay. Repair any open circuits or poor grounds.
  7. Check fuses and relays in the heater supply circuit. Replace blown fuses and test/replace faulty relays. Verify relay control signal to ensure the module is commanding the relay.
  8. If wiring, fuses and relays are good but the heater shows open, replace the heater assembly or the battery pack internal heater component following manufacturer repair guidance.
  9. If the heater and wiring are intact but no control output is present, test/replace the battery/thermal control module or its driver output per service manual.
  10. Clear codes, perform re-test with scan tool and verify heater operation and absence of code. Monitor for recurrence.

Likely causes

  • Open wiring or disconnected connector at the heater plug
  • Failed heater element (internal open)
  • Blown fuse or failed relay feeding the heater
  • Corroded/damaged connector at the battery pack side

Fault status

⚠️ Status
Control module detected an open (no continuity) or interrupted control circuit for Hybrid/EV Battery Pack Coolant Heater B; heater may fail to operate.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

P0E15 P0E17 P0E18 P0E10
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