IMRC Input Error (Bank 1)

What is P1516?

P1516 is a powertrain code indicating an Intake Manifold Runner Control (IMRC) input error on Bank 1, which affects the engine's variable intake system. This medium-severity issue is most commonly reported in Chevrolet Corvettes and often relates to electrical or software gremlins that can sometimes resolve after a few drive cycles. Real owner data shows it can be triggered by issues ranging from simple sensor problems to complex module updates.

Common Causes

• ●Electrical or software gremlins in control modules (mentioned in 25% of reports)
• ●Faulty IMRC sensor or actuator on Bank 1
• ●Wiring harness issues or poor connections

Symptoms You May Notice

• ●Check Engine Light illuminated with no other noticeable drivability issues (reported in most cases)
• ●Potential rough idle or reduced engine performance
• ●Code may clear temporarily after multiple start cycles

How to Fix It

• ●Software update or module reprogramming by dealer (cost varies, difficulty: professional)
• ●Replacing the IMRC actuator or sensor assembly ($150-$400, difficulty: moderate)
• ●Inspecting and repairing wiring harness connections ($20-$130, difficulty: easy to moderate)
• ●Clearing codes and monitoring if issue recurs (no cost, difficulty: easy)