DTC P1899: Park/Neutral Position (PNP) Switch Stuck In Park Or In Gear

NOTE: For component location, see COMPONENT LOCATIONS . For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS .

DTC P1899 will set if incorrect PNP switch input is detected during vehicle operation. DTC will not set during limp-in mode.

Possible Causes

PNP switch defective.
PNP switch sense circuit open or shorted.
PNP switch stuck.
Powertrain Control Module (PCM) defective.

Turn ignition on. Using scan tool, read PNP switch state. While observing scan tool, move gear selector between Park and Reverse. If scan tool displays P/N and D/R, go to next step. If scan tool does not display P/N and D/R, go to step 3 .
Turn ignition off. Inspect wiring and connectors related to PNP switch. Repair as necessary. Perform TEST VER-2A under VERIFICATION TESTS. If wiring and connectors are okay, test is complete.
Turn ignition off. Disconnect PCM connectors. Inspect terminals. Clean or repair as necessary. Using an ohmmeter, check resistance between ground and PNP switch sense circuit at Brown/Light Blue wire in PCM connector C1, terminal No. 6 (Cherokee) or A6 (Wrangler). While observing ohmmeter, move gear selector from Park to Reverse and back to Park. If resistance switched from less than 10 ohms to more than 10 ohms, replace PCM. Perform TEST VER-2A under VERIFICATION TESTS. If resistance was less than 10 ohms at all times, go to next step. If resistance was more than 10 ohms at all times, go to step 5 .
Disconnect PNP switch, located on side of transmission. Inspect connector. Clean or repair as necessary. Using an ohmmeter, check resistance between ground and PNP switch harness connector terminal No. 2 (Black/White wire). If resistance is less than 5 ohms, repair short to ground. Perform TEST VER-2A under VERIFICATION TESTS. If resistance is 5 ohms or more, repair or replace stuck PNP switch. Perform TEST VER-2A under VERIFICATION TESTS.
Using an ohmmeter, check resistance of Brown/Light Blue wire between PNP switch harness connector terminal No. 2 and PCM connector C1, terminal No. 6 (Cherokee) or A6 (Wrangler). If resistance is 5 ohms or more, repair open circuit. Perform TEST VER-2A under VERIFICATION TESTS. If resistance is less than 5 ohms, replace PNP switch. Perform TEST VER-2A under VERIFICATION TESTS.