Chrysler Fault Code 37: baro-read solenoid open or shorted

by Bob O’Neill and Bob Lincoln

• For turbocharged engines, code 37 will be triggered when the baro-read solenoid circuit is open or shorted.
• For normally aspirated (non turbo) engines with automatic transmissions, code 37 will be triggered when the Part Throttle Unlock (PTU) solenoid circuit is open or shorted.
• For normally aspirated cars with manual transmissions, code 37 is sometimes set for no apparent reason.

This is detected when the ECU doesn’t sense near 0vdc or 12vdc at the relay when the solenoid is turned on or off. When code 37 is thrown the power limited light will not be lit and the system will not enter limp mode.

Possible Reasons for Fault Code 37

Poor wiring or connection - Read the page ‘How to troubleshoot drivability issues’. Check the wiring and connections from the logic module to the solenoid.   Clean and re-grease the connectors with dielectric grease.

Defective solenoid - The solenoid is located in the right, front fender next to one to three other solenoids.  See the Understanding Solenoids page for information about how to test and repair solenoids.

Sometimes, a code 37 will be stored on manual-transmission cars, and the Upshift indicator lamp will light, even in 5th gear.  This is a random fault in the ECU, apparently harmless, and can be ignored.

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