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Home / DTC / P06AB — Control Module Internal Temperature Sensor B Circuit

P06AB — Control Module Internal Temperature Sensor B Circuit

Detailed page for trouble code P06AB.

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Code

P06AB

Generic P — Powertrain

Control Module Internal Temperature Sensor B Circuit

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

Causes

  • Open or short in the sensor B wiring harness (to power, ground, or signal)
  • Corroded, loose or damaged connector or pin at the control module
  • Water intrusion or contamination at connector or harness
  • Failed internal temperature sensor (thermistor) or related internal module component
  • Failed control module (internal circuit fault)
  • Intermittent wiring damage (chafing, broken conductor)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated with stored P06AB
  • Stored freeze frame or freeze data showing abnormal internal temperature B values
  • Possible reduced functionality of temperature-dependent systems (fan control, idle, fuel trim) depending on vehicle strategy
  • Intermittent or non-repeatable faults (if wiring is intermittent)
  • No obvious external engine temperature change — fault refers to module internal sensor

What to check

  • Read and record freeze frame and live data for internal temperature sensor B and compare to sensor A (if available)
  • Scan for additional related DTCs (other module temperature codes, communication errors)
  • Visually inspect wiring and connectors near the control module for damage, corrosion, moisture, or bent pins
  • Backprobe the sensor B signal and ground at the module harness connector and observe voltage/response while warming/cooling (if serviceable)
  • Perform continuity and resistance checks of the wiring between module connector and any external junctions per factory wiring diagram
  • Wiggle-test harness while monitoring live data to reproduce intermittent faults

Signal parameters

  • Typical sensor type: internal thermistor (NTC or PTC) monitored by ECM ADC
  • Expected signal voltage range (generic): ~0.1–4.9 V depending on temperature; many systems near ~2.5 V at ambient — consult OEM spec
  • Resistance varies with temperature; check OEM chart if available (no universal resistance values)
  • Look for sudden jumps to near 0 V (short to ground) or near battery voltage (short to power) or open-circuit (no/erratic reading)

Diagnostic algorithm

  1. Verify the code with a scan tool, record freeze frame and live data. Clear the code and see if it returns.
  2. Check for related DTCs and perform basic visual inspection of connectors and wiring at the control module and nearby harness routes.
  3. Monitor live data: compare internal temp sensor B to internal temp sensor A or other temperature inputs. Note steady vs. erratic behavior.
  4. With ignition ON (engine off) backprobe the sensor B signal terminal at the module connector. Measure voltage to ground and to battery. Compare to expected range.
  5. Measure resistance across the sensor circuit if two-wire; if internal to module, measure continuity of the harness to the module pins per wiring diagram.
  6. Inspect pins for corrosion, bent or pushed-out terminals; repair or reseat connector as required.
  7. If wiring and connector tests pass, perform a wiggle test while monitoring data to catch intermittent open/shorts.
  8. If harness/connector repairs do not correct the fault and all external wiring tests OK, consider module internal fault. Verify with factory diagnostics before module replacement.
  9. After repair, clear codes and perform a drive cycle or reproduce conditions to confirm the code does not return.

Likely causes

  • Damaged or corroded connector at the control module
  • Open or shorted signal wire between ECM and external harness
  • Failed internal thermistor or internal module solder/joint fault
  • Moisture contamination causing intermittent readings

Fault status

⚠️ Status
Control Module Internal Temperature Sensor B Circuit — Circuit malfunction (open/short/out-of-range).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P06AA P06AC P0115 P0118 P06AD
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