Code
P060B
ISUZU
P — Powertrain
Internal Control Module A/D Processing Performance
AI status
Completed
Completed
100%
Causes
- Faulty ECM/PCM internal A/D circuit or processor
- Intermittent or low battery/charging system voltage
- Poor or corroded ECU power/ground connections
- Shorted, open or high-resistance sensor signal wiring to the ECU
- Damaged or water-intruded ECU connector or harness
- ECU software/firmware bug or corrupted calibration data
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Stored P060B (and possibly other P06xx) trouble codes
- Erratic or implausible sensor values visible on scan tool
- Reduced driveability, limp-in mode, or engine running irregularly (dependent on affected inputs)
- Intermittent faults that may clear and return, especially after vibration or moisture exposure
What to check
- Retrieve DTCs and freeze-frame/vehicle status with a capable scan tool; note related codes and occurrence conditions
- VISUALLY inspect ECU, connectors and harness for water intrusion, corrosion, bent pins, or physical damage
- Check battery voltage with engine off and running — confirm proper charging system operation
- Verify integrity of ECU power and ground circuits (measure voltage at ECU power pins and continuity to ground)
- Backprobe and monitor sensor input voltages at the ECU connector while operating to identify out-of-range or noisy signals
- Check for related wiring faults: shorts to battery voltage or ground and high resistance in sensor return circuits
Signal parameters
- Battery/charging voltage: approx. 12.0–14.5 V (engine running)
- ECU primary reference voltage: ~5.0 V ±0.25 V (if applicable)
- Sensor input voltages: within expected sensor-specific ranges (commonly 0–5 V)
- Ground continuity from ECU ground pins to chassis: low resistance (typically
- A/D conversion output (scan tool raw counts or live values): consistent and within expected resolution for the monitored sensor
Diagnostic algorithm
- Record DTCs and freeze-frame data; note when code set (conditions, temperature, load)
- Perform visual inspection of ECU and harness for corrosion, water, damaged wires or pins; repair any damage
- Verify battery state-of-charge and charging system operation; restore normal voltage levels before further testing
- With a scan tool, monitor live inputs for sensors that feed the ECM A/D channels; look for steady, plausible voltages and sudden jumps or noise
- Backprobe ECU connector pins to compare sensor output voltage at the sensor versus at the ECU to identify wiring loss or intrusion
- Check ECU power and ground pins for proper voltage and solid ground; repair loose connectors or corrosion
- Inspect for shorts: measure resistance from suspect signal pins to battery positive and to ground with system off; look for unexpected continuity
- If a particular sensor input is abnormal, substitute a known-good sensor or disconnect sensor per manufacturer guidance and observe code/behavior change
- Check CAN/communications for related faults; restore comms faults before condemning ECU
- Review and apply any ECM software updates or technical service bulletins from Isuzu
- If wiring and external components check good and code persists after clearing and road-testing, consider bench-level ECU testing or replacement by qualified shop with OEM programming tools
Likely causes
- Poor or intermittent ECU ground or power supply
- Damaged or contaminated ECU connector pins (water/corrosion)
- Short to voltage or ground on one or more sensor inputs to the ECM
- Failed ECU internal A/D electronics or corrupted firmware
Fault status
Status
Internal Control Module A/D Processing Performance — the ECM has detected that internal analog-to-digital signal processing is outside expected parameters. Verify power/grounds, connector condition, sensor wiring and ECU software before replacing the control module.
Repair difficulty: Hard
Diagnostic time: 2-4 hours
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