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Detroit Fault Codes SPN 91/FMI 14 – EPA10 – GHG14

01/04/2026
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SPN 91/FMI 14 - EPA10 - GHG14
2-Channel Accelerator Pedal Not Learned
SPN 91/FMI 14
Description Pedal Sensor Signal not recognized
Monitored Parameter Pedal Position
Typical Enabling Conditions Always on
Monitor Sequence None
Execution Frequency Continuous when enabling conditions met
Typical Duration 2 Seconds
Dash Lamps CEL
Engine Reaction None
Verification Key Cycle - Ignition ON

Check as follows:

Sensor Connector and Pinout
Function CPC pinout Connector Pinout Comments Harness Connector Body
APS1 1/7 A SENSOR 1
GND1 1/4 B APS1 GND
VCC1 (+5V) 1/8 C APS1 Power Supply
VCC2 (+5V) 3/3 D APS2 Power Supply
GND2 3/2 E APS2 GND
APS2 4/14 F SENSOR 2 Harness Connector and Seal (P/N: 12066317) Terminal Female (P/N: 12103881)
1. Turn the ignition ON (key ON, engine OFF).
2. Connect DiagnosticLink ®; are any other fault codes active?
2.1. Yes; troubleshoot any other faults first.
2.2. No; Go to step 3.
3. Using DiagnosticLink, monitor PWM Pedal Signal GAS1 and PWM Pedal Signal GAS2 under the Instrumentation/Chart tab.
4. Cycle Accelerator Pedal (AP) slowly several times with a full sweep from top to bottom of travel. Does percentage sweep smoothly in relation to pedal travel and return to idle (zero percent)?
4.1. Yes; Go to step 5.
4.2. No; replace the AP. Refer to Original Equipment Manufacturer (OEM) literature.
5. Clear codes and cycle ignition off.
6. Turn the ignition ON (key ON, engine OFF).
7. Does the code return?
7.1. Yes; replace the AP, clear codes and verify repair. Refer to Original Equipment Manufacturer (OEM) literature.
7.2. No; Go to step 8.
8. Gently wiggle pedal and harness connector to simulate road vibration. Go to step 9.
NOTE:  Do not disconnect the Accelerator Pedal (AP) connector at this time.
NOTICE:
Do not tap on AP with metal object or tool as this may damage component.
NOTICE:
A second technician may be required to monitor values during wiggle testing.9. While performing wiggle test , monitor PWM Pedal Signal GAS1 and PWM Pedal Signal GAS2 under the Diagnostic Link Instrumentation/Chart tab.
10. Cycle Accelerator Pedal (AP) slowly several times with a full sweep from top to bottom of travel. Do the percentages sweep smoothly in relation to pedal travel?
10.1. Yes; Go to step 11.
10.2. No; Isolate that section of harness and inspect for wire chaffing, corrosion, improper connections or physical damage and repair as necessary. Verify repair.
11. Disconnect the Accelerator Pedal (AP).
12. Inspect the AP and harness side connectors for signs of damaged, bent, spread, corroded or unseated (pushed out) pins and signs of moisture in the connector or wire damage near the connector. Is any damage found?
12.1. Yes; repair as necessary. Verify repair.
12.2. No; Reconnect the AP. Go to step 13.
13. Gently wiggle CPC harness connectors to simulate road vibration. Go to step 14.
14. While performing wiggle test, monitor PWM Pedal Signal GAS1 and PWM Pedal Signal GAS2 under the DiagnosticLink Instrumentation/Chart tab. Go to step 15.
15. Cycle Accelerator Pedal (AP) slowly several times with a full sweep from top to bottom of travel. Do the percentages sweep smoothly in relation to pedal travel?
15.1. Yes; Go to step 16.
15.2. No; Isolate that section of harness and inspect for wire chaffing, corrosion, improper connections or physical damage and repair as necessary. Verify repair.
16. Disconnect the CPC #1 connector.
17. Disconnect the CPC #3 connector.
18. Disconnect the CPC #4 connector.
19. Inspect the CPC and the harness connectors for signs of damaged, bent, spread, corroded or unseated (pushed out) pins and signs of moisture in the connector or wire damage near the connectors. Is any damage found?
19.1. Yes; repair as necessary. Verify repair.
19.2. No; replace the AP, clear codes and verify repair. Refer to Original Equipment Manufacturer (OEM) literature. Verify repair.

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