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2002 Mazda MPV Code P705: Neutral Safety Switch Fault & Reverse Light Stays On - Solution Guide

Model: 2002 Mazda MPV Fault Code: P2177 Posted: 2016-08-20 20:02

I own a 2002 Mazda MPV that is showing Diagnostic Trouble Code (DTC) P705, indicating a neutral safety switch issue. After replacing the neutral safety switch, the reverse lights remain continuously illuminated. I drove the vehicle for approximately 30 miles and the check engine light reappeared, but my OBD-II scanner no longer detects any codes. The reverse lights stay on even when in park or neutral. What other troubleshooting steps should I take? Any insights or solutions would be greatly appreciated.

Related fault codes
P2177
Comments (2)
Anonymous 2016-08-20 20:09

Reverse lights remain on constantly despite replacing the neutral safety switch. I've confirmed the switch is installed correctly, but the issue persists. Not sure what to do next.

Anonymous 2016-08-21 10:53

This appears to be a circuit-related problem. Possible Causes: • TR signal 'P' circuit shorted between the neutral safety switch and PCM (12V) • TR signal 'N' circuit shorted between the switch and PCM (12V) • TR signal 'D' circuit shorted between the switch and PCM (12V) • TR signal '2' circuit shorted between the switch and PCM (12V) • TR signal '1' circuit shorted between the switch and PCM (12V) • Neutral safety switch or its connector is damaged, or the switch has failed Next steps: Use an OBD-II scanner, consult the vehicle wiring diagram, test with a digital multimeter (DVOM), and follow a trouble-shooting tree to isolate the fault.