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by Bob O’Neill and Bob Lincoln
For Turbo engines, code 26 and 27 are related to the injector driver circuits. Code 27 is related to injector driver circuit 2. It indicates that the injector circuit is either open or shorted. The Power Limited light will not be lit and the system will not enter limp mode.
For Throttle Body Injector (TBI) single injector systems code 27 is thrown when peak injector control circuit is open or shorted.
Causes can include:
Poor wiring or connection - Read the page ‘How to troubleshoot drivability issues’. Check the wiring and connections from the logic module to injectors #3 and #4 for Turbo engines. For TBI engines, check the harness from the TBI injector to the computer. Clean and re-grease the connectors with dielectric grease.
Injector driver transistor failure – When the injector driver is working properly the signal the voltage to the injector should jump to 12vdc when injector is on and drop to 0vdc when the injector is on. These signals can be measured from the power module (or SMEC). If you don’t see these voltages at the harness where it connects to the injector ‘and’ you have insured that the harness is good from the injector connector to the power module (or SMEC) then the power module should be replaced.
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