Transmission Shift Solenoid C Inductive Signature Malfunction (Ford)
What does P1716 mean?
The P1716 code means the vehicle's onboard diagnostic system has detected: Transmission Shift Solenoid C Inductive Signature Malfunction (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- No 3-4 upshift or overdrive
- Poor highway fuel economy
- Transmission stuck in third gear
- Harsh downshifts from overdrive
Probable Causes (Ranked by Likelihood)
- Failed shift solenoid C Very High
- Contamination in solenoid C restricting flow High
- Internal transmission connector pin damage Moderate
- PCM solenoid C driver circuit failure Low
Step-by-Step Diagnostic Procedure
-
Monitor shift solenoid C on a scan tool during 3-4 upshift and 4-3 downshift.
-
Test solenoid C resistance (typically 15-25 ohms) at the transmission connector.
-
Command solenoid C activation with a scan tool and verify physical response.
-
Inspect the solenoid for contamination by removing the valve body.
-
Check the overdrive clutch pack pressure with a gauge to rule out mechanical issues.
Frequently Asked Questions
Why did I lose overdrive?
Shift solenoid C controls the overdrive (4th gear) engagement. If it fails, the transmission cannot shift into or maintain overdrive.
Will driving without overdrive hurt anything?
Short term, no. Long term, the engine runs at higher RPMs on the highway, increasing fuel consumption and wear. The transmission may also run hotter without overdrive lockup.
Are Ford solenoid failures common?
On higher-mileage Ford transmissions (4R70W, 5R55S, 6R80), solenoid failures are a known issue. Preventive solenoid pack replacement during a fluid service is recommended at 100K miles.