P2153 means the engine computer has detected that the supply voltage for fuel injector group C is lower than expected. This usually points to a short to ground, high resistance, open circuit, or failed injector in that group, not the computer itself. The code can cause misfires, rough running, and increased emissions.
Wiring can chafe, melt, or contact metal and pull the injector supply voltage low, causing the PCM to set the code.
An injector coil with an internal short or low resistance can draw excessive current and make the supply circuit voltage drop.
Corroded, loose, or damaged connectors increase resistance or break the circuit, lowering voltage at the injectors.
Terminal spread, corrosion, or moisture at the injector or PCM connector can create voltage loss across the joint.
Rarely, the internal injector driver transistor in the PCM fails and cannot maintain proper voltage; diagnose only after wiring and injectors are ruled out.
It is not recommended; a misfiring cylinder can dump raw fuel into the catalytic converter and cause overheating or damage.
Usually no. PCM failure is one of the least likely causes; most P2153 faults are found in the wiring, connectors, or an injector.
No. The cylinders assigned to group C are manufacturer-specific, so a wiring diagram for your exact engine is needed.
Only the faulty injector or damaged wiring needs repair; replace the whole group only if contamination or damage affects all of them.