5 Volt Supply Output Too Low (Chrysler)
What does P1496 mean?
The P1496 code means the vehicle's onboard diagnostic system has detected: 5 Volt Supply Output Too Low (Chrysler). This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Multiple sensor codes present
- Rough or erratic idle
- Poor throttle response
- Stalling or hesitation during acceleration
Probable Causes (Ranked by Likelihood)
- Sensor with internal short dragging down 5V line Very High
- Chafed wiring shorting 5V reference to ground High
- Water intrusion in a sensor connector Moderate
- Failed MAP or TPS sensor Moderate
- PCM internal 5V regulator failure Low
Step-by-Step Diagnostic Procedure
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Measure the 5V reference at any sensor on the affected circuit. It should be 4.9 to 5.1V with key on engine off.
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If low, disconnect sensors one at a time and recheck voltage after each to isolate the short.
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Inspect connectors for all 5V-powered sensors for water, corrosion, or bent pins.
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Check wiring harness routing for chafing against metal edges, exhaust components, or sharp brackets.
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If all sensors and wiring check good, the PCM may need replacement.
Frequently Asked Questions
How is P1496 different from P1488?
These codes both indicate low 5V supply issues on Chrysler vehicles. P1488 targets the auxiliary 5V supply while P1496 may target a different 5V circuit or the same circuit depending on model year.
Can one bad sensor cause all my other sensors to read wrong?
Yes. Multiple sensors share the same 5V reference wire. If one sensor shorts internally, it pulls the voltage down for all sensors on that circuit, causing multiple incorrect readings and codes.
What sensors use the 5V reference?
Common sensors on the 5V reference include the MAP sensor, throttle position sensor, EGR position sensor, oil pressure sensor, and fuel pressure sensor. The exact list varies by engine and model year.