Techniques for thawing a reductant injector and reductant tank prior to an injection attempt

An engine system comprising:

• an engine configured to generate drive torque to propel a vehicle;
• a selective catalytic reduction (SCR) system configured to treat exhaust gas produced by the engine, the SCR system comprising:
• a solenoid-type reductant injector having a coil and configured to inject reductant into the exhaust gas,
• an SCR catalyst configured to react with a mixture of the reductant and the exhaust gas and output treated exhaust gas,
• a reductant tank configured to house the reductant,
• a heater configured to heat the reductant tank, and
• a reductant supply line configured to supply the reductant from the reductant tank to the reductant injector;
• and
• a controller configured to, when an ambient temperature is less than a predetermined temperature indicative of frozen reductant, (i) enable the heater for a tank thaw period and (ii) provide current to the reductant injector for an injector thaw period, such that the tank thaw period and the injector thaw period end at a same time.