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DTC codes / Mitsubishi codes / P1496

P1496 · Mitsubishi5 Volt Supply Output Too Low

P1496 on Mitsubishi vehicles means the engine control unit (ECU) has detected that the 5-volt reference supply it provides to one or more sensors has dropped below the expected voltage. The ECU monitors this supply and sets the code when the voltage falls outside the normal operating range, indicating a short to ground or excessive current draw on the circuit.

SystemPowertrain
Code typeMitsubishi specific
SeverityMedium
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • Rough idle or poor engine performance if the affected sensor is critical to fuel or ignition control.
  • Erratic readings from sensors such as the throttle position sensor or manifold absolute pressure sensor.
  • Transmission shift quality issues if the 5-volt supply feeds a transmission sensor.
  • In some cases, the engine may enter limp mode or stall if the voltage drop is severe.
  • Other warning lights may appear if multiple sensors share the same 5-volt reference.

Common causes, most likely first

  1. A short to ground in the 5-volt reference wire feeding any sensor on the circuit.
  2. A faulty sensor internally shorted and pulling the 5-volt supply low.
  3. Corroded or damaged wiring harness connectors causing increased resistance.
  4. Water intrusion into a sensor or connector, leading to a short.
  5. A damaged ECU driver circuit internally shorted, though this is less common.
  6. Aftermarket accessories improperly tapped into the 5-volt reference circuit.

How to diagnose and fix it

  1. Scan all modules for codes and record freeze-frame data to identify which sensor circuit is affected.
  2. Disconnect sensors one by one that share the 5-volt reference and observe if the voltage returns to normal, isolating the faulty component.
  3. Visually inspect the wiring harness and connectors for chafing, corrosion, or signs of water intrusion.
  4. Measure resistance to ground on the 5-volt reference wire at each sensor connector with the ECU disconnected; a reading below specification indicates a short.
  5. Repair any damaged wiring or replace corroded connectors, then clear codes and verify the 5-volt supply is stable.
  6. If no sensor or wiring fault is found, test the ECU by substituting a known-good unit or performing a bench test of the 5-volt output.
  7. After repairs, perform a road test with a scan tool to confirm the code does not return and all sensor readings are within normal range.

Common misdiagnosis traps for P1496

  • A faulty sensor that shorts internally can pull the entire 5-volt reference down, affecting multiple sensors and setting codes for those sensors as well, which often leads to replacing good parts.
  • The 5-volt supply is shared among several sensors on many Mitsubishi models, so a short in one sensor can cause drivability issues that seem unrelated to that sensor's function.
  • Water intrusion into the throttle position sensor or mass airflow sensor connector is a frequent cause on older Mitsubishi vehicles, especially after engine washing or in humid climates.
  • Technicians sometimes overlook aftermarket wiring for alarms or audio systems that tap into the 5-volt reference, causing a constant drain that sets P1496.
  • The ECU itself is rarely the cause, but a shorted sensor left unrepaired for a long time can damage the ECU's 5-volt regulator, leading to a recurring code after sensor replacement.

Can I keep driving with P1496?

If the check engine light is on but the engine runs normally, you can drive cautiously to a repair shop, but avoid heavy acceleration or towing. If the engine runs poorly, stalls, or enters limp mode, stop driving and have the vehicle towed to prevent damage or unsafe operation.

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 Mitsubishi vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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