Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM L3]DTC P0850NOTES

2010 Mazda 5 Sport, 2.3 L, Standard

DTC P0850: Notes

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Notes

DTC P0850 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES

DTC P0850

Neutral switch input circuit problem

DETECTION CONDITION

The PCM monitors changes in input voltage from the neutral switch. If the PCM does not detect voltage changes while running vehicle with vehicle speed above 30 km/h {19 mph} and clutch pedal turns press and depress 10 times repeatedly, the PCM determines that the neutral switch circuit has malfunction.

Diagnostic support note

This is a continuous monitor (CCM).
MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA (Mode 2/Mode12) is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Poor connection of neutral switch connector
Neutral switch malfunction
Open circuit in wiring harness between ground and neutral switch terminal B
PCM connector or terminal malfunction
Open circuit in wiring harness between neutral switch terminal A and PCM terminal 1BC
Short to ground in wiring harness between neutral switch terminal A and PCM terminal 1 BC
PCM malfunction

Courtesy of MAZDA MOTORS CORP.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.