CAT Engine 27714 Fault Code: Throttle Lock Set/Accel Switch Voltage Below Normal
Also called Throttle Lock Set/Accel Switch : Voltage Below Normal
Throttle Lock Set/Accel Switch Voltage Below Normal · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Code 27714 sets when both contacts of the throttle lock set/accel switch are detected in the closed state at the same time, which the ECM reads as a short circuit. The ECM logs the code, disables the throttle hold and throttle lock features, and may show a warning on the control panel display.
Medium severity. This code does not stop the engine or cause damage, but it disables throttle lock and throttle hold, which affects operator control of engine speed. It should be diagnosed before relying on those features again.
What does CAT Engine error code 27714 mean?
Code 27714 relates to the throttle lock set/accel switch, a two-position momentary rocker switch used to set or increase the desired engine speed when the throttle lock feature is active. The throttle lock switch itself is a separate three-position rocker that selects between Automatic mode, Manual mode, and OFF.
This code is generated when both contacts of the throttle lock set/accel switch are in the closed state at the same time. Since a normal momentary switch should only close one contact when actuated, having both closed at once tells the ECM there is a short circuit condition in the switch or its wiring.
When the code sets, the ECM logs the fault and disables automatic control of engine speed through both the throttle hold feature and the throttle lock feature. A warning may appear on the control panel display. The operator is left controlling engine speed only with the throttle pedal until the fault is corrected.
Common causes of 27714
- Harness or wiring abrasion, corrosion, or pinch points affecting the switch circuit
- Fault in the circuit for the throttle lock switch itself
- Fault within the throttle lock switch
- Problem in the circuit between the ECM and the throttle lock switch, including an open or short circuit in that wiring
- Faulty or bad ECM needing replacement
- Problem in the circuit for the throttle lock resume/decel switch
- Throttle lock resume/decel switch needing replacement
- Problem in the circuit between the ECM and the throttle lock resume/decel switch
- Faulty connector and/or wiring at the throttle hold set/accel switch
- Intermittent connection problem in the harness
How to troubleshoot CAT Engine 27714: first checks
- Inspect the wiring harness and connectors at the throttle lock set/accel switch for abrasion, corrosion, or pinch points, since damaged insulation can cause both contacts to read as closed
- Check the connector pins for corrosion, moisture, or loose terminals and clean or reseat as needed
- Test continuity and resistance in the circuit between the ECM and the throttle lock set/accel switch, looking for an open or short circuit
- Check the throttle lock resume/decel switch circuit as well, since a fault there can produce a related warning
- Operate the throttle lock switch and set/accel switch through all positions while monitoring the electronic service tool for the fault status to identify if the problem is intermittent
- If wiring and connectors check good, suspect the switch itself and consider replacement before condemning the ECM
How the code clears
No separate clearing step is listed beyond correcting the root cause. Once the wiring, connector, or switch fault is repaired so that the two contacts no longer read as simultaneously closed, the throttle lock and throttle hold features should return to normal operation. No reset procedure is listed for this code.
Frequently asked questions
What does CAT code 27714 mean?
It means the ECM detected both contacts of the throttle lock set/accel switch closed at the same time, which it interprets as a short circuit. This disables the throttle hold and throttle lock features until the fault is fixed.
Can I still drive or operate the machine with code 27714 active?
Yes, the engine keeps running and the throttle pedal still controls engine speed normally. You lose the convenience of throttle lock and throttle hold until the fault is repaired.
Is code 27714 dangerous?
It is not listed as a safety-critical failure on its own. It disables a convenience feature rather than affecting engine protection or braking, but any electrical fault should be diagnosed to prevent it from getting worse or masking other wiring issues.
What is the difference between the throttle lock switch and the throttle lock set/accel switch?
The throttle lock switch is a three-position rocker that selects Automatic mode, Manual mode, or OFF. The throttle lock set/accel switch is a separate two-position momentary rocker used to set and increase the desired engine speed once throttle lock is active. Code 27714 is about the set/accel switch.
Will replacing the ECM fix code 27714?
A faulty ECM is listed as a possible cause, but it is one of several. Wiring damage, connector corrosion, and a faulty switch are more common causes and should be ruled out first before replacing the ECM.
Does code 27714 affect the throttle lock resume/decel switch too?
The main fault is in the set/accel switch circuit, but problems in the circuit for the throttle lock resume/decel switch are also listed as possible causes, so that circuit should be checked during diagnosis.
How do I know if the problem is intermittent?
An intermittent connection problem is listed as a possible cause. Operating the switches through their full range while monitoring the fault status on the electronic service tool can help reveal whether the fault comes and goes with movement or vibration.