What does Pontiac P1899 mean?

Pontiac code P1899: Park Neutral Position Switch Stuck In Park or In Gear. It relates to the powertrain on Pontiac vehicles.

Can P1899 be turned off in the ECU?

DTC removal is possible for off-road/motorsport use after the underlying fault or hardware change (e.g. DPF/EGR removal). Safety-critical codes should be fixed, not suppressed.

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Pontiac P1899

Park Neutral Position Switch Stuck In Park or In Gear

What P1899 means on a Pontiac

On Pontiac vehicles, P1899 is logged when the ECU detects a fault in the powertrain: “Park Neutral Position Switch Stuck In Park or In Gear”. P1899 is a manufacturer-specific Pontiac code (the "1" after the letter marks an OEM-defined code), so its meaning applies to Pontiac and may differ on other makes.

Common causes & symptoms

Typical triggers for a powertrain code like P1899 include faulty or ageing sensors, wiring/connector faults, a clogged or removed component, or a value drifting outside the ECU's expected window. Symptoms range from a check-engine light only, to limp mode, rough running, higher consumption or failed emissions tests.

P1899 and ECU tuning

When a Pontiac has had hardware changed for off-road/motorsport use (for example a removed DPF or EGR), the related monitor must be disabled in the ECU map or the code re-appears. Softechpro Solutions performs DPF/EGR/AdBlue/DTC off and recalculates the checksum, so codes like P1899 stay cleared after the flash. Genuine faults should always be repaired, not just hidden.

Related Pontiac codes

P1763 P1764 P1765 P1830

Need to clear P1899 after a delete?

Softechpro Solutions does DPF/EGR/AdBlue/DTC off + checksum for 260+ ECU families — from €98.99/mo.

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